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coplanar

adjective co·pla·nar \ (ˌ)kō-ˈplā-nər , -ˌnär \
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Definition of coplanar

: lying or acting in the same plane
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coplanarity

play \ˌkō-plā-ˈner-ə-tē, -ˈna-rə-\ noun

First Known Use of coplanar

1853

in the meaning defined above

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