[month] n, pl months [ME, fr. OE monath; akin to OHG manod month, OE mona moon] (bef. 12c) 1: a measure of time corresponding nearly to the period of the moon's revolution and amounting to approximately
4. weeks or 30 days or 1/12 of a year
2. pl: an indefinite usu. extended period of time "he has been gone for ~s"
3: one ninth of the typical duration of human pregnancy "she was in her eighth ~"