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coplanar

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

Origin of coplanar

1860–65; co- + planar < Late Latin plānāris; see plane1, -ar1
Related formsco·pla·nar·i·ty, nounnon·co·pla·nar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for coplanar

coplanar

adjective
  1. lying in the same planecoplanar lines
Derived Formscoplanarity, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for coplanar

adj.

1862, from co- + planar.

Online Etymology Dictionary, © 2010 Douglas Harper