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Webster 1913 Edition

Noun.

[L.

acumen

, fr.

acuere

to sharpen. Cf.

Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination.

Selden.

Syn. – Sharpness; sagacity; keenness; shrewdness; acuteness.

Noun.

[L. acumen, from acus or acuo.]

A sharp point; and figuratively, quickness of perception, the faculty of nice discrimination.