Definitions
1.nounAn operation."My mother's going in for her knee op today."
2.nounAn amateur radio operator.
3.nounAn operator on IRC, who can moderate the chat channel, ban users, etc.
4.nounOp art; a style of abstract art."an op painting; op artworks"
5.verbTo promote (an IRC user) to an operator.
6.nounOperations
7.noun(IRC) operator status"Why don't I have ops in this channel any more?"