A person who accomplishes tasks with efficiency and grace, especially one with verbal skills who is persuasive in interpersonal relationships, negotiation, etc.

plural of wireless operator

A covert operation typically involving activities that are highly clandestine and outside of standard military protocol.

plural of tour operator

plural of multiplicative operation

plural of telephone operator

plural of operating room

In the work (already) cited or quoted. Used, typically in footnotes and endnotes, to cite in an abbreviated form a source that has been cited previously; frequently abbreviated as op. cit.

plural of smooth operator

plural of additive operation