Acumen
Pronunciation : A*cu"men
Part of Speech : n.
Etymology : [L. acumen, fr. acuere to sharpen. Cf. Acute.]
Definition : Defn: Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination. Selden.
Syn. -- Sharpness; sagacity; keenness; shrewdness; acuteness.
Source : Webster's Unabridged Dictionary, 1913