masculine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to men or boys; male.
• adjective Characterized by or possessing qualities traditionally attributed to men, such as aggressiveness.
• adjective Grammar Relating or belonging to the gender of words or forms that refer chiefly to males or to things grammatically classified as male.
• adjective Music Ending on an accented beat.
• noun The masculine gender.
• noun A word or word form of the masculine gender.
• noun A male person.

from The Century Dictionary.

• Male: opposed to female.
• Having the distinguishing characteristics of the male sex among human beings, physical or mental; pertaining to a man or to men; of manlike quality: opposed to feminine: as, the masculine element of society; masculine spirit or courage.
• As applied derogatively to women, unwomanly; bold; forward: as, her manners are coarse and masculine; she has a masculine air or stride.
• Suitable for the male sex; adapted to or intended for the use of males: as, masculine garments.
• In grammar, belonging to or having the characteristics of that one of the so-called genders into which the nouns, etc., of some languages are divided which includes as its prominent part the names of male beings; having inflections or forms belonging to such words: as, a masculine noun; a masculine termination. See gender.
• In botany, relating to stamens: same as male, 2.
• noun In grammar, the masculine gender; a word of this gender.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Of the male sex; not female.
• adjective Having the qualities of a man; suitable to, or characteristic of, a man; virile; not feminine or effeminate; strong; robust.
• adjective rare Belonging to males; appropriated to, or used by, males.
• adjective (Gram.) Having the inflections of, or construed with, words pertaining especially to male beings, as distinguished from feminine and neuter. See Gender.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective pertaining to male humans, men:
• adjective grammar in many inflected languages:
• noun grammar The masculine gender.
• noun That which is masculine.
• noun rare A man.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective associated with men and not with women
• adjective (music or poetry) ending on an accented beat or syllable
• noun a gender that refers chiefly (but not exclusively) to males or to objects classified as male
• adjective of grammatical gender