Acumen \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. web1913

acumen n 1: a tapering point 2: shrewdness shown by keen insight [syn: {insightfulness}] wn