英和和英

to be effective

effective

become effective

to be efficient

in an effective manner

effective breakthrough

an effective cutback

be in effect

handle effectively

efficient

to take effect―bear fruit―do its work―be effectual―be successful―succeed―（武器なら）―do execution―tell

with efficiency

the effective range

efficiency

a gain in efficiency

efficient in one's actions

an efficient incentive

（法律なら）A law comes into effect―comes into force―becomes effective―becomes operative―（契約などなら）―A contract becomes valid―takes effect.

an effect

potentially useful

work efficiency

job performance

to give results―take effect

of a condition, effective

work efficiency

adequate for practical use

be of use

My attempt has proved effectual―been successful―succeeded.

the state of being in effect or being operative

My labours are crowned with success