An adult male human.
All human males collectively: mankind.
A human, a person regardless of gender or sex, usually an adult. (See usage notes.)
All humans collectively: mankind, humankind, humanity. (Sometimes capitalized as Man.)
A member of the genus Homo, especially of the species Homo sapiens.
A male person, usually an adult; a (generally adult male) sentient being, whether human, supernatural, elf, alien, etc.
An adult male who has, to an eminent degree, qualities considered masculine, such as strength, integrity, and devotion to family; a mensch.
(obsolete) Manliness; the quality or state of being manly.
A husband.
A male lover; a boyfriend.
A male enthusiast or devotee; a male who is very fond of or devoted to a specified kind of thing. (Used as the last element of a compound.)
A person, usually male, who has duties or skills associated with a specified thing. (Used as the last element of a compound.)
A person, usually male, who can fulfill one's requirements with regard to a specified matter.
A male who belongs to a particular group: an employee, a student or alumnus, a representative, etc.
An adult male servant.
A vassal; a subject.
A piece or token used in board games such as backgammon.
A term of familiar address often implying on the part of the speaker some degree of authority, impatience, or haste.
A friendly term of address usually reserved for other adult males.
A player on whom another is playing, with the intent of limiting their attacking impact.
A clipping of "in man" or equivalent used in the CGS unit roentgen equivalent man.

Only used in man enough

Used to place emphasis upon something or someone; sometimes, but not always, when actually addressing a man.

(slang) Used to refer to oneself or one's group: I, we; construed in the third person.
(slang) You; construed in the third person.
(slang) Any person, one

To supply (something) with staff or crew (of either sex).
To take up position in order to operate (something).
To brace (oneself), to fortify or steel (oneself) in a manly way. (Compare man up.)
(obsolete) To wait on, attend to or escort.
(obsolete) To accustom (a raptor or other type of bird) to the presence of people.

A command used to display help pages in Unix and Unix-like operating systems.

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Who is this man?