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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.

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Definitions of acumen

acumen (n.)
a tapering point;
acumen (n.)
shrewdness shown by keen insight;
Synonyms: insightfulness
From wordnet.princeton.edu