A decisive point at which a significant change or historical event occurs, or at which a decision must be made. / (calculus) A maximum or minimum on a graph. / A crossroads. / A T-junction.

A specific topic raised in a conversation or argument which is intended as a basis for further discussion, especially one which represents a point of view.

The appearance of rock after having been worn smooth by a passing glacier.

The bust of an artist by the artist him/herself; a portrait of the painter who painted it.

(advertising) The first spot in a print advertisement noticed by the reader.

(advertising) One of four archetypal dramatic structures of commercials, characterized by an emotionally neutral beginning with an enormous leap in positive emotions generated by seeing the branded product in use.

The ability of a weapon (typically a firearm or other ranged weapon) to rapidly incapacitate or immobilize a target.

A powdered abrasive cleaner.

A series of points in three-dimensional space that collectively describe the geometry of a physical object.

(physics, chemistry) the pH of a colloidal suspension or of an ampholyte at which the solute does not move in an electrophoretic field; symbol pI