Coplanar

Full definition of coplanar

Adjective

1. (geometry, of at least two things, usually lines) Within the same plane.
2. (astronomy, of multiple planets or other orbiting bodies) Orbiting a central celestial object within the same orbital plane.
• 2009, Robert Naeye, "Exoplanets' Dance Reveals They're Coplanar," skyandtelescope.com, 9 Jan. (retrieved 9 Jan. 2009):Gliese 876’s third, innermost planet . . . is likely to be coplanar with its outer two companions.

Related terms

• anticoplanar
• coplanarity
• syncoplanar