A worldly or sophisticated man, one well versed in the ways and dealings of humankind.

(dated) A literary man; a scholar or author.

(military, archaic except humorous) A man whose occupation is fighting in wars; a soldier, a warrior.

Alternative form of man-of-war

Of a system: including both human and machine and/or their interface.

(idiomatic) A person who always agrees with their employer or superior.

A man who is wise. / A man who is a sage or seer. / A magus or wizard, now especially one of the three biblical magi.

(historical) A US government agent fighting organized crime in the interwar years. / Any person working for the US government, especially in undercover work.

(bingo) five

(dated) An expression of surprise