1. (n.) The act or process of operating; agency; the exertion of power, physical, mechanical, or moral.

2. (n.) The method of working; mode of action.

3. (n.) That which is operated or accomplished; an effect brought about in accordance with a definite plan; as, military or naval operations.

4. (n.) Effect produced; influence.

5. (n.) Something to be done; some transformation to be made upon quantities, the transformation being indicated either by rules or symbols.

6. (n.) Any methodical action of the hand, or of the hand with instruments, on the human body, to produce a curative or remedial effect, as in amputation, etc.

accomplished fact accomplishment achievement act acta acting action activism activity adventure affair amphibious operations amputation anastomotic operation appliance application attempt behavior bloodless operation blow bringing to fruition business business deal campaign capital operation combined operations commercial transaction commitment compensating operation contract control corneal transplant coup crescent operation deal dealings deed direction doing doings dry run duty effective effectuation efficacious effort elective operation emergency operation employment end use endeavor engagement enterprise excision execution exercise exercising exertion exploit exploitation exploratory operation fait accompli feat fenestration operation fluid operations function functional functioning gest go hand handiwork handling heart transplant immediate purpose in effect in force interval operation job kidney transplant logistics major operation management managing maneuver maneuvers manipulation measure military operations minor operation minor operations mission motion move movement movements negotiation obligation occupation office operating operational operational purpose operations operative organ transplant organ transplantation overproduction overseas operations overt act package deal palliative operation passage performance plan play practice praxis procedure proceeding production productiveness program project proposition purpose radical operation realization removal res gestae resection role running section staff work step stroke stunt surgical intervention surgical operation surgical technique swing task the knife thing thing done tour de force transaction transplant turn ultimate purpose undertaking use using utilization venture war game war plans work working workings works