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effective

ef·fec·tive

effective

 
 
pronunciation:
ih fek tihv
part of speech: adjective
definition 1: producing an adequate or desired result, or having the power to produce such a result.
Attacking at dawn was an effective strategy.
synonyms:
effectual, efficacious, strong, valid
antonyms:
feckless, feeble, futile, impotent, ineffective, weak
similar words:
active, capable, cogent, efficient, forceful, influential, potent, powerful, productive, telling, trenchant
definition 2: existing or operative; functioning.
The new rule will become effective at midnight tonight.
synonyms:
active, in effect, operative
antonyms:
expired, inoperative, invalid, void
similar words:
alive, functioning, valid
derivations: effectively (adv.), effectiveness (n.)