coplanar

[koh-pley-ner]
adjective Mathematics.
being or operating in the same plane.

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

coplanarity, noun
noncoplanar, adjective
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Collins
World English Dictionary
coplanar (kəʊˈpleɪnə)
 
adj
lying in the same plane: coplanar lines
 
copla'narity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

coplanar
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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