An employee or other worker with some particular function or skill. / A spy, secret agent, or detective. / A participant in an operation.

plural of operation

simple past tense and past participle of operate

(in combination) operated by the means specified e.g. a battery-operated toy / having undergone an operation

plural of operative

Third-person singular simple present indicative form of operate

plural of opera

plural of operator

Able to be operated or used / Able to be put into operation; practicable / Able to be treated by surgery

The extent to which a system or device is operable.