A correspondence between the points in the plane of a triangle not lying on the sides of the triangle and lines in the plane of the triangle not passing through the vertices of the triangle.

plural of polarity item

(linguistics) A lexical item that can appear only in environments associated with a particular grammatical polarity.

(quantum field theory) One of a set of three spacelike (and possibly also one timelike) four-dimensional vectors which are orthonormal within some inertial reference frame.

plural of polarization vector

Representative of electric potential at the ends of a circuit which consists of positive and negative polarities.

The polarization of the light received from distant stars as a result of interaction with dust particles

plural of polar willow

Synonym of polar bear plunge

Any of a system of coordinates by which a point is located in space by its distance from a pole, the angle between the polar axis and its radius vector, and its longitude