operation

operation [äp΄ə rā′shən]

n.

[ME operacion < OFr < L operatio]

1. the act, process, or method of operating

2. the condition of being in action or at work

3. a process or action that is part of a series in some work

4.

a) any movement or series of movements made in carrying out strategic military plans

b) [pl.] a center where such activities are monitored or supervised, as at an air base

c) any specific plan, project, venture, etc. [Operation Cleanup]

5. any surgical procedure performed, usually with the aid of instruments, to remedy a physical ailment or defect

6. Math. any process, as addition, division, etc., involving a change or transformation in a quantity

——————

in operation

1. in the act or process of making, working, etc.

2. having an influence or effect; in force