Etymology
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bigwig (n.)

also big-wig, "great man, person of consequence," 1781, from big + wig, in reference to the imposing wigs formerly worn by men of rank or authority.

updated on May 26, 2017

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Definitions of bigwig from WordNet

bigwig (n.)
the most important person in a group or undertaking;
Synonyms: kingpin / top banana
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.