operative
/ˈɑpəɹətɪv/ adjective C1- Effectual or important. · He's usually in a good mood — the operative word there being "usually". Today was a disaster.
- Functional, in working order.
- Having the power of acting; hence, exerting force, physical or moral; active in the production of effects. · an operative motive
- Producing the appropriate or designed effect; efficacious. · an operative dose, rule, or penalty
- Based upon, or consisting of, a surgical operation or operations. · operative surgery
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