Democritus, c.460-c.370 B.C., Greek philosopher of Abdera; pupil of Leucippus. His theory of the nature of the physical world was the most radical and scientific attempted up to his time. He avoided the abstractions of his predecessors, Anaxagoras (mind) and Empedocles (harmony and discord), by employing consistent mechanistic postulates that required no supernatural intervention. He held that all things were composed of atoms; these he asserted to be tiny particles, imperceptible to the senses, composed of exactly the same matter but different in size, shape, and weight. They were underived, indivisible, and indestructible. Democritus postulated the constant motion of atoms and, on this basis, explained the creation of worlds. He held that the whirling motion caused by the falling of atoms resulted in aggregations—the heavier atoms forming the earth and the lighter ones the heavenly bodies. He taught that what the senses perceive as quality is merely the result of a specific quantitative distribution of atoms. Sense perception yields only confused knowledge, telling us merely how things affect us; thought alone can apprehend the nature of things. Democritus' ethics were moderately hedonistic, teaching that the true end of life is happiness achieved in inner tranquility.

See A. T. Cole, Democritus and the Sources of Greek Anthropology (1967).

(born circa 460—died circa 370 BC) Greek philosopher. Though only a few fragments of his work survive, he was apparently the first to describe invisible “atoms” as the basis of all matter. His atoms—indestructible, indivisible, incompressible, uniform, and differing only in size, shape, and motion—anticipated with surprising accuracy those discovered by 20th-century scientists. For his amusement at human foibles, he has been called “the Laughing Philosopher.” Seealso atomism.

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Democritus (Greek: Δημόκριτος) was a pre-Socratic Greek materialist philosopher (born at Abdera in Thrace ca. 460 BC - died ca 370 BC). Democritus was a student of Leucippus and co-originator of the belief that all matter is made up of various imperishable, indivisible elements which he called atoma (sg. atomon) or "indivisible units", from which we get the English word atom. It is virtually impossible to tell which of these ideas were unique to Democritus and which are attributable to Leucippus.


Democritus was born in Abdera in Thrace, an Ionian colony of Teos, although some called him a Milesian. His year of birth was 460 BC according to Apollodorus, who is probably more reliable than Thrasyllus who placed it ten years earlier. John Burnet has argued that the date of 460 is "too early", since according to Diogenes Laertius 9.41 Democritus said that he was a "young man (neos)" during Anaxagoras' old age (circa 440-428). It was said that Democritus' father was so wealthy that he received Xerxes on his march through Abdera. Democritus spent the inheritance which his father left him on travels into distant countries, to satisfy his thirst for knowledge. He travelled to Asia, and was even said to have reached India and Ethiopia. We know that he wrote on Babylon and Meroe; he must also have visited Egypt, and Diodorus Siculus states that he lived there for five years. He himself declared, that among his contemporaries none had made greater journeys, seen more countries, and met more scholars than himself. He particularly mentions the Egyptian mathematicians, whose knowledge he praises. Theophrastus, too, spoke of him as a man who had seen many countries. During his travels, according to Diogenes Laërtius, he became acquainted with the Chaldean magi. A certain "Ostanes", one of the magi accompanying Xerxes was also said to have taught him.

After returning to his native land he occupied himself with natural philosophy. He travelled throughout Greece to acquire a knowledge of its culture. He mentions many Greek philosophers in his writings, and his wealth enabled him to purchase their writings. Leucippus, the founder of the atomism, was the greatest influence upon him. He also praises Anaxagoras. The tradition that he was friends with Hippocrates seems to have been based on spurious letters. He may have been acquainted with Socrates, but Plato does not mention him and Democritus himself is quoted as saying, "I came to Athens and no one knew me.. Though Aristotle viewed him as a pre-Socratic., it should be noticed that since Socrates was born in ca. 469 BC (about 9 years before Democritus), it is very possible that Aristotle's remark was not meant to be a chronological one, but directed towards his philosophical similarity with other pre-Socratic thinkers.

The many anecdotes about Democritus, especially in Diogenes Laërtius, attest to his disinterestedness, modesty, and simplicity, and show that he lived exclusively for his studies. One story has him deliberately blinding himself in order to be less disturbed in his pursuits; it may well be true that he lost his sight in old age. He was cheerful, and was always ready to see the comical side of life, which later writers took to mean that he always laughed at the foolishness of people.

He was highly esteemed by his fellow-citizens, "because," as Diogenes Laërtius says, "he had foretold them some things which events proved to be true," which may refer to his knowledge of natural phaenomena. According to Diodorus Siculus, Democritus died at the age of 90, which would put his death around 370 BC, but other writers have him living to 104, or even 109.

Atoms and the void

Democritus agreed that everything which is must be eternal, but denied that "the void" can be equated with nothing. This makes him the first thinker on record to argue the existence of an entirely empty "void". In order to explain the change around us from basic, unchangeable substance he created a theory that argued that there are various basic elements which always existed but can be rearranged into many different forms. Democritus' theory argued that atoms only had several properties, particularly size, shape, and (perhaps) weight; all other properties that we attribute to matter, such as color and taste, are but the result of complex interactions between the atoms in our bodies and the atoms of the matter that we are examining. Furthermore, he believed that the real properties of atoms determine the perceived properties of matter--for example, something that is solid is made of small, pointy atoms, while something that has water like properties is made of large, round atoms. Some types of matter are particularly solid because their atoms have hooks to attach to each other; some are oily because they are made of very fine, small atoms which can easily slip past each other. In Democritus' own words:

By convention there is sweet, by convention there is bitterness, by convention hot and cold, by convention color; but in reality there are only atoms and the void.

Aristotle tells us that this theory of matter, commonly called atomism, was a reaction to Parmenides, who denied the existence of motion, change, or the void. Parmenides argued that the existence of a thing implied that it could not have "come into being", because "nothing comes from nothing". Moreover, he argued, movement was impossible, because one must move into "the void" and (as he identified "the void" with "nothing") the void does not exist and cannot be "moved into". His main contribution to chemistry was the suggestion of the atom which he called "atomos".

Soul, sense, and reason

Though intelligence is allowed to explain the organization of the world, according to Democritus, he does allow for the existence of a soul, which he contends is composed of exceedingly fine and spherical atoma (now called atoms, as mentioned above). He holds that, "spherical atoma move because it is their nature never to be still, and as they move they draw the whole body along with them, and set it in motion." In this way, he viewed soul-atoma as being similar to fire-atoma: small, spherical, capable of penetrating solid bodies and good examples of spontaneous motion.

Democritus explained senses along these lines as well. He hypothesized that different tastes were a result of differently shaped atoms in contact with the tongue. Smells and sounds could be explained similarly. Vision works by the eye receiving "images" or "effluences" of bodies that are emanated. He stated that, "Sweet exists by convention, bitter by convention, color by convention; but in reality atoms and the void alone exist." This means that senses could not provide a direct or certain knowledge of the world. In his words, "It's necessary to realize that by this principle man is cut off from the real." Later philosophers use this to deny that any reliable knowledge can be obtained, but Democritus felt differently:

One view purports that this finer form is reasoning, although Democritus does not explain reason's place in the atomistic view.

Scientific interest


He was also a pioneer of mathematics and geometry in particular. We only know this through citations of his works (titled On Numbers, On Geometrics, On Tangencies, On Mapping, and On Irrationals) in other writings, since most of Democritus' body of work did not survive the Middle Ages. Democritus was among the first to observe that a cone or pyramid has one-third the volume of a cylinder or prism respectively with the same base and height.

Minerals and plants

Petronius in his Satyricon states that "Democritus... extracted the essence of every known herb and then devoted the rest of his life to researches into the properties of minerals and plants."


Democritus was also the first philosopher we know who realized that the celestial body we perceive as the Milky Way is formed from the light of distant stars. Other philosophers, including later Aristotle, argued against this. Democritus was among the first to propose that the universe contains many worlds, some of them inhabited:
"In some worlds there is no Sun and Moon while in others they are larger than in our world and in others more numerous. In some parts there are more worlds, in others fewer (...); in some parts they are arising, in others failing. There are some worlds devoid of living creatures or plants or any moisture."


The knowledge of truth according to Democritus is difficult, since the perception through the senses is subjective. As from the same senses derive different impressions for each individual, then through the sense-impressions we cannot judge the truth. We can only interpret the sense data through the intellect and grasp the truth, because the truth (aletheia) is at the bottom (en bythoe).

There are two kinds of knowing, the one he calls “legitimate” (gnesie: genuine) and the other “bastard” (skotie: obscure). The “bastard” knowledge is concerned with the perception through the senses, therefore it is insufficient and subjective. The reason is that the sense-perception is due to the effluences of the atoms (aporroai) from the objects to the senses. When these different shapes of atoms come to us, stimulate our senses according to their shape, and there from arise our sense-impressions. (Fr. 135, Theophrastus De Sensu 49-83).

The second sort of knowledge, the “legitimate” one, can be achieved through the intellect, in other words, all the sense-data from the “bastard” must be elaborated through reasoning. In this way one can get away from the false perception of the “bastard” knowledge and grasp the truth through the inductive reasoning. Therefore, the man after taking into account the sense-impressions, can examine the causes of the appearances, draw conclusions about the laws that govern the appearances, and find out the causality (aetiologia) by which they are related. This is the procedure of thought from the parts to the whole or else from the apparent to non-apparent (inductive reasoning). “ But in the Canons Democritus says there are two kinds of knowing, one through the senses and the other through the intellect. Of these he calls the one through the intellect ‘legitimate’ attesting its trustworthiness for the judgement of truth, and through the senses he names ‘bastard’ denying its inerrancy in the discrimination of what is true. To quote his actual words: Of knowledge there are two forms, one legitimate, one bastard. To the bastard belong all this group: sight, hearing, smell, taste, touch. The other is legitimate and separate from that. Then, preferring the legitimate to the bastard, he continues: When the bastard can no longer see any smaller, or hear, or smell, or taste, or perceive by touch, but finer matters have to be examined, then comes the legitimate, since it has a finer organ of perception.” (Fr. 11 Sextus, Adv. Math. VII, 138).

“ In the Confirmations .. he says: But we in actuality grasp nothing for certain, but what shifts in accordance with the condition of the body and of the things (atoms) which enter it and press upon it.” (Fr. 9 Sextus Adv. Math. VII 136).

“ Democritus used to say that 'he prefers to discover a causality rather than become a king of Persia'.” (Fr.118)

(Excerpt from Democritus' Gnoseology 'Handbook of Greek Philosophy: From Thales to the Stoics Analysis and Fragments', Nikolaos Bakalis, Trafford Publishing 2005, ISBN 1-4120-4843-5.


Although Democritus is best known as the propounder of atomism, most of his extant fragments actually relate to the field of ethics. The excerpts are notably fragments quoted by other authors (mostly Stobaeus) and attributed to Democritus, who is also known as "The Laughing Philosopher" (for laughing at human follies) and by his fellow citizens as "The Mocker". Modern scholars credit Democritus with being "the earliest thinker reported as having explicitly posited a supreme good or goal, which he called 'cheerfulness' or 'wellbeing', and which he appears to have identified with the untroubled enjoyment of life ([DK 68] B 188: 'Joy and sorrow are the distinguishing mark of things beneficial and harmful'...). According to Democritus' philosophy, this supreme good was to be achieved through moderation in the pursuit of pleasure, distinguishing useful pleasures from harmful ones, and conforming to conventional morality. This seems to constitute "a recommendation to a life of moderate, enlightened hedonism" similar to that presented by Socrates in Plato's Protagoras and later made famous by Epicurus.

Among numerous examples of the Democritean ethical fragments are the following:

  • Disease occurs in a household, or in a life, just as it does in a body." (DK 68 B 288)
  • "Moderation increases enjoyment, and makes pleasure even greater." (DK 68 B 211)
  • "The brave man is he who overcomes not only his enemies but his pleasures. There are some men who are masters of cities but slaves to women." (DK 68 B 214)
  • "Proclus states that Pythagoras and Epicurus agree with Cratylus, but Democritus and Aristotle agree with Hermogenes, the former that names arise by nature, the latter that they arise by chance. Pythagoras thought that the soul gave the names, deriving them like images of reality from the mind. But Democritus thought that the proof of their chance origin was fourfold: (1) the calling of different things by the same name; (2)having several names for the same thing; (3)change of name; (4)lack of name."
  • "Nature and instruction are similar; for instruction transforms the man."(DK 68 B 33)
  • "If any man listens to my opinions, here recorded, with intelligence, he will achieve many things worthy of a good man, and avoid doing many unworthy things.(DK 68 B 35)
  • "He who chooses the advantages of the soul chooses things more divine, but he who chooses those of the body, chooses things human." (DK 68 B 37)


See also


  • Bailey C. (1928) The Greek Atomists and Epicurus. Oxford
  • Bakalis Nikolaos (2005) Handbook of Greek Philosophy: From Thales to the Stoics Analysis and Fragments, Trafford Publishing, ISBN 1-4120-4843-5
  • Barnes J. (1982) The Presocratic Philosophers, Routledge Revised Edition
  • Burnet J. (2003) Early Greek Philosophy, Kessinger Publishing
  • Guthrie W. K. (1979) A History of Greek Philosophy – The Presocratic tradition from Parmenides to Democritus, Cambridge University Press.
  • Kirk G. S., Raven J. E. and Schofield M. (1983) The Presocratic Philosophers, Cambridge University Press, Second edition.
  • Melchert, Norman (2002). The Great Conversation: A Historical Introduction to Philosophy. McGraw Hill. ISBN 0-19-517510-7.
  • Ancilla To The Pre-Socratic Philosophers, translated by Kathleen Freeman.
  • Pyle, C. M. (1997). 'Democritus and Heracleitus: An Excursus on the Cover of this Book,' Milan and Lombardy in the Renaissance. Essays in Cultural History. Rome, La Fenice. (Istituto di Filologia Moderna, Università di Parma: Testi e Studi, Nuova Serie: Studi 1.) (Fortuna of the Laughing and Weeping Philosophers topos)
  • Petronius. Satyricon. Trans. William Arrowsmith. New York: A Meridian Book, 1987.

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