producing a desired or intended result; efficacious

the result, effect, or efficacy produced by an action or cause

a beneficial result or profit, especially in an economic or social context

effect (scientific phenomenon)

healing efficacy; therapeutic effect

lacking legal force or official authority; null and void

characterized by high productivity and minimal waste of time or effort

effect; result; outcome

to offer one's services or to work for someone in a specific capacity

(of a law, contract, agreement, ban etc.) to come into force, go into effect, or become operative

the results, achievements, and efficiency of an individual or organization in a professional context

to show results; to be effective

the power or capacity to produce a desired effect; effectiveness

to become invalid or no longer operative, as with laws, contracts, or medicine

to serve in some capacity or render service to a cause or person

actual effect or practical result

the duration during which a document, contract, or license remains legally effective

visual or sound effects used in cinema, television, or digital media

to vow loyalty and devotion to

to produce the intended effect or achieve the desired result

to be effective (idiom)

to show or produce a noticeable effect

the state or quality of being useful or effective

high efficiency

to yield results

medicinal effect

equivalent; equal in effect

a metallurgical process where the physical properties of a metal or alloy change over time, often used to increase strength

highly effective and yielding significant results

to copy or imitate

producing a rapid or immediate effect, particularly in medical or agricultural contexts

the quality of being current, up-to-date, or relevant to the present moment

render service to repay kindness

not producing the intended or desired result; having low efficacy

to follow the example of or to imitate as a model

a remarkably good or miraculous effect, especially of a medicine or treatment

A highly effective medicine that produces exceptional or rapid results.

highly efficient or possessing great capacity and effectiveness

effectiveness of fertilizer

a desired or expected result, or the quality of being effective

after-effect

to warn against following bad examples; as a warning to others

To mimic someone's behavior or traits without understanding them, making oneself look foolish.

subordinates follow the example of their superiors