Etymology
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acumen (n.)

"quickness of perception, keen insight," 1530s, from Latin acumen "a point, sting," hence, figuratively, "mental sharpness, shrewdness," from acuere "to sharpen," literal and figurative (of intellect, emotion, etc.), related to acus "a needle" (from PIE root *ak- "be sharp, rise (out) to a point, pierce"). Related: Acuminous.

updated on December 12, 2020

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Definitions of acumen from WordNet

acumen (n.)
a tapering point;
acumen (n.)
shrewdness shown by keen insight;
Synonyms: insightfulness
From wordnet.princeton.edu, not affiliated with etymonline.