effect, effectiveness, efficacy...

to be effective, to take effect, to be good (for)...

efficiency

valid, effective, yuko (judo)

result (that makes an act worthwhile), worth (in doing something), value...

effect, efficacy, validity...

invalid, void, ineffective...

statute of limitations, lapse of rights after a period of time, prescription (including acquisitive and extinctive prescription)...

effect, virtue, efficacy...

effect, virtue, efficacy...

practical effect, efficacy, efficiency

coming into effect

effective, successful

use, utility, effect...

opposite effect, adverse effect, backfiring

effect, effectiveness, efficacy...

immediate effect, instant effect

to bring out (the effect of), to put to good use, to make use of (e.g. threats)...

efficient

medical efficacy, effect of a medicine

effectiveness, efficacy, efficaciousness...

specific medicine, wonder drug, silver bullet

to bring out (the effect of), to put to good use, to make use of (e.g. threats)...

lapse, abatement, invalidation...

efficacy, effect

great effect

great efficiency

efficacy

delayed effect

speedy effect