tetragon

A polygon with four sides and four angles; a quadrilateral.

In geometry, a figure having four angles; a quadrangle; a quadrilateral.

In astrology, an aspect of two planets with regard to the earth when they are distant from each other 90°, or the fourth part of a circle; quartile aspect; square.

A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.

An aspect of two planets with regard to the earth when they are distant from each other ninety degrees, or the fourth of a circle.