month

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month是可數(shù)名詞,基本意思是“月”“月份”,還可指“一個(gè)月”,大約四個(gè)星期的時(shí)間。
表示“在某月份”時(shí)常用介詞in,但當(dāng)month前有every, each, next, any, all, last, this, that等修飾時(shí),介詞in一般要省略。
month是指時(shí)間的可數(shù)名詞,而一年中每月份的名稱是專用名稱,第一個(gè)字母要大寫。
表示“在…個(gè)月(時(shí)間)內(nèi)”時(shí),介詞用within或in,不過,在美國(guó)口語(yǔ)中in還有“在…(個(gè)月)時(shí)間后”的意思。
month用作定語(yǔ)從句的先行詞時(shí),關(guān)系詞that〔when〕常省略。
當(dāng)以現(xiàn)在為時(shí)間參照點(diǎn)時(shí), next month前不帶冠詞; 當(dāng)以過去某時(shí)間為時(shí)間參照點(diǎn)時(shí), 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)