Answer by Greg De Santis · Mar 16, 2011 at 01:56 PM
Source is the cause/beginning, and the end result/opposite is the effect, end, result, aftermath, and byproduct.
And here is a good list of appropriate antonyms for "source": aftereffect, aftermath, arrangement, backwash, by-product, cessation, close, completion, conclusion, consequence, consummation, corollary, creature, crop, decision, denouement, determination, development, emanation, end, ensual, event, eventuality, execution, finish, fruit, fruition, harvest, issue, offshoot, outcome, outcropping, outgrowth, payoff, proceeds, product, production, reaction, repercussion, returns, sequel, sequence, settlement, termination, and upshot.
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