adjective Mathematics.
being or operating in the same plane.

1860–65; co- + planar < Late Latin plānāris; see plane1, -ar1

coplanarity, noun
noncoplanar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coplanar (kəʊˈpleɪnə)
lying in the same plane: coplanar lines

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1862, from co- + planar.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Actually, make that four non-coplanar points plus a fixed ordering of them.
The important consequence of both possible origins is that the orbits of the rings and the main body would be coplanar.
The problem with orbits is that unless they are coplanar with the equator, they have a nasty tendency to cross paths.
Orbiting the equator would not result in one eclipse per day, since the equator is not coplanar with the ecliptic.
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