Penetration /(?)/

Pen·e·tra·tion

Penetration

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