1 tr. manage, work, control; put or keep in a functional state.
2 intr. be in action; function.
3 intr. produce an effect; exercise influence (the tax operates to our disadvantage).
4 intr. (often foll. by on) a perform a surgical operation. b conduct a military or naval action. c be active in business etc., esp. dealing in stocks and shares.
5 intr. (foll. by on) influence or affect (feelings etc.).
6 tr. bring about; accomplish.
Phrases and idioms:
operating system the basic software that enables the running of a computer program. operating theatre (or room) a room for surgical operations.
Etymology: L operari to work f. opus operis work
Useful english dictionary. 2012.