coplanar
UK /kəʊˈpleɪnə(ɹ)/ US /kəʊˈpleɪnə(ɹ)/
adj 2
Definitions
adj
1
Within the same plane.
2
Orbiting a central celestial object within the same orbital plane.
Gliese 876’s third, innermost planet . . . is likely to be coplanar with its outer two companions.
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