(n.) Quickness of perception or discernment; sharpness; as, great acumen in trading stocks\; penetration of mind; the faculty of nice discrimination.

acuity acuteness apperception astuteness cogency critical discernment discernment discrimination farseeingness farsightedness flair foresight foresightedness incisiveness insight judgment keenness longheadedness longsightedness penetration perception perceptiveness percipience perspicaciousness perspicacity perspicuity perspicuousness providence sagaciousness sagacity sensibility sharpness shrewdness trenchancy