効 - merit, efficacy, efficiency

practical effect; efficacy; efficiency

effect; effectiveness; efficacy; result

effective; successful

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

valid; effective

efficient

opposite effect; adverse effect; backfiring

use; utility; effect; benefit

specific medicine; wonder drug; silver bullet

efficiency

coming into effect

invalid; void; ineffective; unavailable