>Acumen \uh-KYOO-mun\ (noun)

MSWORD’s definition:
Sharpness of mind – The ability to make quick, accurate, intelligent judgments about people or situations.

M-W’s Word Central:
1. Keenness of mind
2. Shrewdness

M-W also says acumen is used to signify “good practical judgment and a natural ability to see what isn’t obvious.”

So, one could have acumen about anything, really.

Due to Sally’s extensive knowledge and dead-on acumen regarding the big cats, the tense situation was dissolved and no one got hurt.

John’s keen business acumen was the reason his store flourished during an economic downturn.