効 - merit, efficacy, efficiency

practical effect; efficacy; efficiency

immediate effect; instant effect

coming into effect

efficient

to be effective; to take effect; to be good (for)

effect; virtue; efficacy; impression

valid; effective

efficiency

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

effective; successful

invalid; void; ineffective; unavailable

specific medicine; wonder drug; silver bullet