"effective" in the adjective sense
1. effective, effectual, efficacious
producing or capable of producing an intended result or having a striking effect
"an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation"-LewisMumford
"effective teaching methods"
"effective steps toward peace"
"made an effective entrance"
"his complaint proved to be effectual in bringing action"
"an efficacious law"
2. effective, efficient
able to accomplish a purpose functioning effectively
"people who will do nothing unless they get something out of it for themselves are often highly effective persons..."-G.B.Shaw
"an efficient secretary"
"the efficient cause of the revolution"
works well as a means or remedy
"an effective reprimand"
"a lotion that is effective in cases of prickly heat"
4. effective, good, in effect, in force
exerting force or influence
"the law is effective immediately"
"a warranty good for two years"
"the law is already in effect (or in force)"
existing in fact not theoretical real
"a decline in the effective demand"
"confused increased equipment and expenditure with the quantity of effective work done"
ready for service
"the fort was held by about 100 effective soldiers"
Source: WordNet® (An amazing lexical database of English)
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