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ef·fec·tive

effective

 
 
pronunciation:
ih fek tihv
part of speech: adjective
definition 1: able to make happen or change something.
That was an effective way to get the work done.
similar words:
active, capable, efficient, forceful, influential, powerful, productive
definition 2: in operation.
This rule is effective immediately.
synonyms:
active, in effect
antonyms:
expired, invalid, void
similar words:
alive, functioning, valid
derivations: effectively (adv.), effectiveness (n.)