Available Definitions:
1) n. - The white spot on a target, at which an arrow or other missile is aimed.
2) n. - With all small arms, the second point in which the natural line of sight, when horizontal, cuts the trajectory.
3) n. - With artillery, the point where the projectile first strikes the horizontal plane on which the gun stands, the axis of the piece being horizontal.
4) a. - Directed in a line toward the object aimed at; aimed directly toward the mark.
5) a. - Hence, direct; plain; unqualified; -- said of language; as, a point-blank assertion.
6) adv. - In a point-blank manner.