adjective

1. male; of men or boys
2. having qualities regarded as characteristic of men and boys, as strength, vigor, boldness, etc.; manly; virile
3. suitable to or characteristic of a man
4. mannish: said of women
5. Gram. designating, of, or belonging to the gender of words denoting or referring to males, as well as many other words to which no distinction of sex is attributed
6. Music designating or of a cadence ending on an accented note or chord
7. Prosody
   1. ending with a stressed syllable, as a line of verse
   2. designating or of rhyme in which the rhyming elements are stressed final syllables (Ex.: hill, fill, enjoy, destroy)

Etymology: ME masculyn < OFr masculin < L masculinus < masculus, male < mas, male

noun

1. the masculine gender
2. a word or form in this gender