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operative

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The definition of operative is in force, functioning or having control, or refers to something that has the most significance or the greatest importance.

(adjective)

When a new solar-powered car is now functioning and runs successfully, this is an example of a situation where the car is operative.
When a law is in place banning watering your lawn, this is an example of a time when the water ban is operative.
When you want to emphasize that someone is reallyvery wealthy, this is an example of a situation where you might say "the operative word is rich."

See operative in Webster's New World College Dictionary

adjective

capable of, characterized by, or in operation
1. accomplishing what is desired; effective
2. of primary importance; key; essential: the operative word in a sentence
connected with physical work or mechanical action
Surgery of or resulting from a surgical operation

Origin: Fr opératif < LL(Ec) operativus

noun

a worker, esp. one skilled in industrial work
☆ a detective or spy

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operatively adverb

See operative in American Heritage Dictionary 4

adjective

Being in effect; having force; operating: “Two major tendencies are operative in the American political system” (Heinz Eulau).
Functioning effectively; efficient.
Engaged in or concerned with physical or mechanical activity.
Of, relating to, or resulting from a surgical operation.
Significant; most important; key: The operative word is “low-fat.”

noun

A skilled worker, especially in industry.
a. A secret agent; a spy.
b. A private investigator.
One who works for a political organization, often wielding influence out of public view.

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