plural of oper

The act of operating or working; operation.

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.

In operation; that operates. / Involved in an operation.

present participle and gerund of operate

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