operator

(countable, uncountable) A person or organisation that operates a device, system, service, etc.
(countable, uncountable) A telecommunications facilitator whose job is to connect or otherwise assist callers.
(countable, uncountable) A member of a military special operations unit.
(uncountable) The game of Chinese whispers.
(countable, informal, uncountable) A person who is adept at making deals or getting results, especially one who uses questionable methods.
(countable, uncountable) A function or other mapping that carries values defined on a domain into another value or set of values in a defined range.
(countable, uncountable) The administrator of a channel or network on IRC.
(countable, uncountable) A symbol that represents a construct in a programming language and differs from a normal function in its syntax.
(countable, uncountable) A kind of expression that enters into an a-bar movement dependency and is said to bind a variable.
(countable, uncountable) A bus driver.
(countable, uncountable) The company that operates a mine; often the same one that owns the mine.
(countable, slang, uncountable) A thief or charlatan.
(countable, slang, uncountable) A major criminal.
(countable, dated, slang, uncountable) Someone who is successful at pursuing women; a player.