eff.

Adjective

effective (comparative more effective, superlative most effective)

1. Having the power to produce a required effect or effects.
   • The pill is an effective method of birth control.

   Synonyms:

   efficacious

2. Producing a decided or decisive effect.
   • The president delivered an effective speech!

   Synonyms:

   telling

3. Efficient, serviceable, or operative, available for useful work.
   • How long does it take to make a bunch of civilians an effective military force?

   Antonyms:

   nominal

4. Actually in effect.
   • effective immediately
5. Having no negative coefficients.
6. Such that no group element acts trivially.

See all 8 meanings of effective