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English word acumen comes from Proto-Indo-European *h₂ḱ-, and later Latin acus (A needle, a pin. Bodkin.)
*h₂ḱ- (Proto-Indo-European)
acus (Latin)
A needle, a pin. Bodkin.
acumen (Latin)
A sharpened point.
acumen (English)
(anatomy) A bony, often sharp, protuberance, especially that of the ischium.. (botany) A sharp, tapering point extending from a plant.. Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination.