Also called calendar month.any of the twelve parts, as January or February, into which the calendar year is divided.
2.
the time from any day of one calendar month to the corresponding day of the next.
3.
a period of four weeks or 30 days.
4.
Also called solar month.one-twelfth of a solar or tropical year.
5.
Also called lunar month.the period of a complete revolution of the moon around the earth, as the period between successive new moons (synodic month), equal to 29.531 days, or the period between successive conjunctions with a star (sidereal month), equal to 27.322 days, or the period between successive perigees (anomalistic month), equal to 27.555 days, or the period between successive similar nodes (nodical month or draconic month), equal to 27.212 days.
6.
an unusually long period of time of indefinite length: I haven't seen him for months.
[Origin: bef. 900; ME; OE mōnath; c. OHG mānōd, ON mānathr.See moon]
month, in chronology, the conventional period of a lunation, i.e., passage of the moon through all its phases. It is usually computed at approximately 29 or 30 days. For the computation of the month and its harmony with the solar calendar and for the months in others than the Gregorian calendar, see calendar. For the difference between the sidereal month and the synodic month, see moon. Certain stones have in ancient and modern times been connected with the months; these lucky stones, or birthstones, are often given as follows: January [from the god Janus]: garnet; February [Lat.,=expiatory, because of ancient rites]: amethyst; March [from the god Mars]: bloodstone or aquamarine; April: diamond; May: agate or emerald; June [from the gens Junius]: pearl or moonstone; July [from Julius Caesar]: ruby or onyx; August [from Augustus]: carnelian or peridot; September [Lat.,= seven; formerly the 7th month]: chrysolite or sapphire; October [eight]: beryl, tourmaline or opal; November [nine]: topaz; December [ten]: turquoise or zircon.
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