planar

[pley-ner]
adjective
1.
of or pertaining to a geometric plane.
2.
flat or level.

Origin:
1840–50; < Late Latin plānāris flat, of a level surface, equivalent to Latin plān(um) plane1 + -āris -ar1

planarity [pluh-nair-i-tee] , noun
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World English Dictionary
planar (ˈpleɪnə)
 
adj
1.  of or relating to a plane
2.  lying in one plane; flat
 
[C19: from Late Latin plānāris on level ground, from Latin plānus flat]
 
planarity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Again, nobody relishes the prospect of making the radical move away from planar to vertical transistors.
Either way, the debris must have settled down into circular and planar orbits relatively quickly, through collisions.
The planar geography of the region also favours urban growth and agglomerations.
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