operativeness

Obsolete form of operose.

Abbreviation of Old Persian.

That operates to produce an effect.

An operative person or thing. / (psychology) Any of a class of behaviors that produce consequences by operating (i.e., acting) upon the environment.

plural of operation

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

plural of operative

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