coplanar

C3O1P3L1A1N1A1R1
/kəʊˈpleɪnə(ɹ)/

adjective

Within the same plane.

Similar
planartwo-dimensional
OriginEnglish planar ← Latin co- ← Proto-Italic *kom- →
UncommonScrabble 12
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Meanings

adjectivecoplanar (not comparable)
  1. not comparableusually lines or plane figuresgeometryWithin the same plane.
  2. not comparableastronomyOrbiting 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.

    2009 January 9, Robert Naeye, “Exoplanets' Dance Reveals They're Coplanar”, in skyandtelescope.com, retrieved 09 Jan 2009

Synonyms & antonyms

adjectivelying in the same plane

Similar
planartwo-dimensional
Also see
planartwo-dimensional

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Proto-Indo-European*ḱe?
  2. Proto-Indo-European*ḱóm
  3. Proto-Italic*kom
  4. Proto-Italic*kom-
  5. Latincon-
  6. Latinco-
  7. Englishco-
  8. Englishplanar
  9. Englishcoplanar

From co- + planar.

Full word history & related roots →

Translations

Catalan coplanari
  • coplanarigeometry: within the same plane
Chinese Mandarin 共面
  • 共面 (gòngmiàn)geometry: within the same plane
Finnish koplanaarinen, samantasoinen
  • koplanaarinengeometry: within the same plane
  • samantasoinengeometry: within the same plane
French coplanaire
  • coplanairegeometry: within the same plane
German komplanar
  • komplanargeometry: within the same plane
Greek συνεπίπεδος
  • συνεπίπεδος (synepípedos)geometry: within the same plane
Italian complanare
  • complanaregeometry: within the same plane
Polish współpłaszczyznowy
  • współpłaszczyznowygeometry: within the same plane
Russian комплана́рный
  • комплана́рный (komplanárnyj)geometry: within the same plane
Spanish coplanario
  • coplanariogeometry: within the same plane

Rhymes & wordplay

Rhymes with coplanar

containertrainermanormaintainerplanarentertainerretainerstrainerbrainerplanerdrainerdetainerstainerplainerexplainermainerabstainerBremainerchicanerfeignergrainermainormainourobtainer
All rhymes →

Anagrams

procanal
Cite this entry
APA

coplanar. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/coplanar

MLA

“coplanar.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/coplanar. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “coplanar,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/coplanar.

Source: coplanar on Wiktionary, CC BY-SA 4.0.