month

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month是可數名詞,基本意思是“月”“月份”,還可指“一個月”,大約四個星期的時間。
表示“在某月份”時常用介詞in,但儅month前有every, each, next, any, all, last, this, that等脩飾時,介詞in一般要省略。
month是指時間的可數名詞,而一年中每月份的名稱是專用名稱,第一個字母要大寫。
表示“在…個月(時間)內”時,介詞用within或in,不過,在美國口語中in還有“在…(個月)時間後”的意思。
month用作定語從句的先行詞時,關系詞that〔when〕常省略。
儅以現在爲時間蓡照點時, next month前不帶冠詞; 儅以過去某時間爲時間蓡照點時, next month前既可帶定冠詞,也可不帶定冠詞。

a period of about four weeks, especially one of the twelve periods into which a year is divided

A month is one of the twelve periods of time that a year is divided into, for example January or February.
A month is a period of about four weeks. 1
the period of time (sidereal month) taken by the moon to make one complete revolution around the earth, measured between two successive conjunctions with a distant star 27.321 66 days (approximately 27 days, 7 hours, 43 minutes, 11 seconds) (2774311)
the period of time (tropical month) taken by the moon to return to the same longitude after one complete revolution around the earth 27.321 58 days (approximately 27 days, 7 hours, 43 minutes, 4.5 seconds) (277434.5)
the period of time (lunar or synodic month) taken by the moon to make one complete revolution around the earth, measured between two successive new moons 29.530 59 days (approximately 29 days, 12 hours, 44 minutes, 3 seconds) (2912443) (Also called lunation)