Penetration

01 n. The act or process of penetrating, piercing, or entering; also, the act of mentally penetrating into, or comprehending, anything difficult.

1.
The act or process of penetrating, piercing, or entering; also, the act of mentally penetrating into, or comprehending, anything difficult.
“And to each in ward part, With gentle penetration, though unseen, Shoots invisible virtue even to the deep.” — Milton.

“A penetration into the difficulties of algebra.” — Watts.
2.
Acuteness; insight; sharp discoverment; sagacity; as, a person of singular penetration.