Available Definitions:
1) a. - Forcibly entering, or adapted to enter, at or by a point; perforating; penetrating; keen; -- used also figuratively; as, a piercing instrument, or thrust.
2) v. t. - To penetrate; to enter; to force a way into or through; to pass into or through; as, to pierce the enemy's line; a shot pierced the ship.
3) v. t. - Fig.: To penetrate; to affect deeply; as, to pierce a mystery.
4) v. i. - To enter; to penetrate; to make a way into or through something, as a pointed instrument does; -- used literally and figuratively.