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producing or capable of producing an intended result or having a striking effect
able to accomplish a purpose; functioning effectively
works well as a means or remedy
exerting force or influence
existing in fact; not theoretical; real
ready for service
in an effective manner
in actuality or reality or fact
power to be effective; the quality of being able to bring about an effect
capacity to produce strong physiological or chemical effects
English Definitions from WordNet 3.0
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