A‐cu″men (�), n. [L. acumen, fr. acuere to sharpen. Cf. Acute.] Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination. Selden.
Syn. — Sharpness; sagacity; keenness; shrewdness; acuteness.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.