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in the PONS Dictionary

op·era·tion [ˌɒpər'eɪʃən] N

1. operation no pl (way of functioning):

operation
operation
operation of a theory

2. operation no pl (functioning state):

operation
operation LAW
to come into operation machine
to come into operation plan, rule, law
to put sth into operation machine
to put sth into operation regulations
to put sth into operation scheme, plan

3. operation (process):

operation

4. operation (business):

operation

5. operation (activity):

operation
operation MIL
operation MIL
undercover operation MIL

6. operation (surgery):

operation

'search op·era·tion N

search operation
a small-scale operation fig
daring rescue operation
minor operation