STRONGS NT 3376: μήν (n)

μήν (n), genitive μηνός, ὁ (with the Alex. the accusative μηναν, Revelation 22:2 Lachmann; on which form see references under ἄρσην, at the end); (from Homer down);

1. a month: Luke 1:24, 26, 36, 56; Luke 4:25; Acts 7:20; Acts 18:11; Acts 19:8; Acts 20:3; Acts 28:11; James 5:17; Revelation 9:5, 10, 15; Revelation 11:2; Revelation 13:5; Revelation 22:2.

2. the time of new moon, new moon (barbarous Latinnovilunium: after the use of the Hebrew חֹדֶשׁ, which denotes both a 'month' and a 'new moon,' as in Numbers 28:11; Numbers 29:1): Galatians 4:10 (Lightfoot compares Isaiah 66:23) (the first day of each month, when the new moon appeared, was a festival among the Hebrews; cf. Leviticus 23:24; Numbers 28:11; Psalm 80:4 ()); (others refer the passage to 1 (see Meyer at the passage)).