Standard Lemma guide

coplanar

adj · 3 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /kəʊˈpleɪnə(ɹ)/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -eɪnə(ɹ)

1

adj

Meaning 1

Within the same plane.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Qualifier: usually lines or plane figures

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Orbiting a central celestial object within the same orbital plane.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adjective satellite

Meaning 3

lying in the same plane

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin co-der. English co- English planar English coplanar From co- + planar.

Across languages

Translations

12 source translations are retained for this English entry.

  • Catalan: coplanari — geometry: within the same plane
  • Chinese Mandarin: 共面 (gòngmiàn) — geometry: within the same plane
  • Finnish: koplanaarinen — geometry: within the same plane
  • Finnish: samantasoinen — geometry: within the same plane
  • French: coplanaire — geometry: within the same plane
  • German: komplanar — geometry: within the same plane
  • Greek: συνεπίπεδος (synepípedos) — geometry: within the same plane
  • Italian: complanare — geometry: within the same plane
  • Manx: co-phlaanagh — geometry: within the same plane
  • Polish: współpłaszczyznowy — geometry: within the same plane
  • Russian: комплана́рный (komplanárnyj) — geometry: within the same plane
  • Spanish: coplanario — geometry: within the same plane