coplanar

co- +‎ planar

• IPA^(key): /kəʊˈpleɪnə(ɹ)/
• Rhymes: -eɪnə(r)

coplanar (not comparable)

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.

• anticoplanar
• coplanarity
• syncoplanar

• coincident
• collinear

coplanar m or f (plural coplanares, comparable)

1. coplanar

• IPA^(key): /koplaˈnaɾ/

coplanar (plural coplanares)

1. coplanar