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effective

ef·fec·tive

effective

 
pronunciation:
ih fek tihv
part of speech: adjective
definition 1: able to produce a result that you want.
That's a very effective medicine.
similar words:
active, capable, efficient, powerful
definition 2: in operation.
This rule is effective immediately.
antonyms:
expired
similar words:
functioning
derivations: effectively (adv.), effectiveness (n.)