co·pla·nar

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

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

co·pla·nar·i·ty, noun
non·co·pla·nar, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
coplanar (kəʊˈpleɪnə) [Click for IPA pronunciation guide]
 
adj
lying in the same plane: coplanar lines
 
copla'narity
 
n

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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00:10
Coplanar is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a scrap or morsel of food left at a meal.
Etymonline
Word Origin & History

coplanar
1862, from co- + planar.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Orbiting the equator would not result in one eclipse per day, since the equator is not coplanar with the ecliptic.
The problem with orbits is that unless they are coplanar with the equator, they have a nasty tendency to cross paths.
The coplanar geometries are more commonly used in the x-ray experiments since they are simpler to implement.
The important consequence of both possible origins is that the orbits of the rings and the main body would be coplanar.
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