Definitions of vocabulary words are available from online dictionaries such as Dictionary.com, Merriam-Webster.com and TheFreeDictionary.com. Additionally, Vocabulary.com is a website dedicated to defining words and improving people's vocabulary.
Find the definitions of words on Dictionary.com by typing the word into the search bar. In addition to definitions, this website offers information on the origins of words and provides example sentences. Pronunciation guides and word translators are also available. The site also provides a list of synonyms and antonyms for words.
Merriam-Webster.com offers much of the same information. Each website also features a "word of the day" to help people learn new words.