month

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month是可数名词,基本意思是“月”“月份”,还可指“一个月”,大约四个星期的时间。
表示“在某月份”时常用介词in,但当month前有every, each, next, any, all, last, this, that等修饰时,介词in一般要省略。
month是指时间的可数名词,而一年中每月份的名称是专用名称,第一个字母要大写。
表示“在…个月(时间)内”时,介词用within或in,不过,在美国口语中in还有“在…(个月)时间后”的意思。
month用作定语从句的先行词时,关系词that〔when〕常省略。
当以现在为时间参照点时, next month前不带冠词; 当以过去某时间为时间参照点时, next month前既可带定冠词,也可不带定冠词。

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)