Acumen

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

acumen
ăcūmĕn, ĭnis, n. [acuo], a point to prick or sting with; diff. fr. cacumen, which designates merely ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
acumen
acūmen inis, n acuo. — Prop., a point : stili: lignum: sine acumine, O.: commissa in unum tereti a...

An Elementary Latin Dictionary