2 definitions found From WordNet (r) 2.0 [wn]: whereby adverb 1: as a result of which 2: by or through which; "the means whereby we achieved our goal" From The Collaborative International Dictionary of English v.0.44 [gcide]: Whereby \Where*by"\, adverb 1. By which; -- used relatively. ''You take my life when you take the means whereby I life.'' --Shak. 2. By what; how; -- used interrogatively. Whereby shall I know this? --Luke i. 18.

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