1. A reference to a human being, regardless of gender or age; a person.
2. A human or an adult-male human belonging to a specific occupation, group, nationality, or other category; for example, it is often used in combinations: a TV repairman, a milkman, a congressman, a freeman.
3. The human race; mankind; such as, man's quest for peace.
4. In zoology, a member of the genus Homo, family Hominidae, an order of Primates, class Mammalia, characterized by an erect posture and an opposable thumb.

A member of the only species, Homo sapiens, distinguished by a highly developed brain, the capacity for abstract reasoning, and the ability to communicate by means of organized speech and recorded information in a variety of symbolic systems.

5. A male human endowed with qualities; such as, strength, considered characteristic of manhood.

Traditionally, the oldest use of the term man and words derived from it (men, manhood, women, etc.), indicated any or all members of the human race regardless of gender or age.