coplanar
adj/kəʊˈpleɪnə(ɹ)/
Etymology From co- + planar.
1
Geometry, Mathematics, Sciences Of at least two things Within the same plane.
Usually lines or plane figures
2
Astronomy, Natural sciences Orbiting a central celestial object within the same orbital plane.
Of multiple planets or other orbiting bodies
- Gliese 876’s third, innermost planet . . . is likely to be coplanar with its outer two companions.2009 January 9, Robert Naeye, “Exoplanets' Dance Reveals They're Coplanar”, in skyandtelescope.com, retrieved 09 Jan 2009:
- Derived terms
- coplanarly, noncoplanar
- Related terms
- anticoplanar, coplanarity, syncoplanar, coincident, collinear