n. An aspect of two planets with regard to the Earth when they are distant from each other ninety degrees, or a quarter-circle.
the GNU version of the Collaborative International Dictionary of English
n. A plane figure having four sides and angles; a quadrangle, as a square, a rhombus, etc.
n. 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.
The Century Dictionary and Cyclopedia
n. In geometry, a figure having four angles; a quadrangle; a quadrilateral.
n. 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.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a four-sided polygon
Word Usage
"I'm sure she's pulling her gray hair out at missing her chance to baffle both kids and parents with "tetragon", but hey, she could always write a sequel!)"