coplanar

from WordNet (r) 3.0 (2006)
coplanar
    adj 1: lying in the same plane
from The Collaborative International Dictionary of English v.0.48
Coplanar \Co*plan"ar\ (k[-o]*pl[=a]n"[~e]r), a. [Pref. co- +
   plane.] (Math.)
   Situated in one plane.
   [1913 Webster]
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