noun

• One who operates.
• A telecommunications facilitator whose job is to establish temporary network connections.
• A member of a military special operations unit.
• (uncountable) The game of Chinese whispers.
• (informal) A person who is adept at making deals or getting results, especially one who uses questionable methods.
• (mathematics) A function or other mapping that carries variables defined on a domain into another variable or set of variables in a defined range.
• (computing) The administrator of a channel or network on IRC.
• (computing) A symbol that represents a construct in a programming language and differs from a normal function in its syntax.
• (linguistics) A kind of expression that enters into an a-bar movement dependency and is said to bind a variable.
• (transport) A bus driver.
• (slang) A thief or charlatan.
• (slang) A major criminal.
• (slang, dated) Someone who is successful at pursuing women; a player.