Standard Lemma guide

planar

adj · 5 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.

  • General-American: /ˈpleɪnɚ/
  • Received-Pronunciation: /ˈpleɪnə/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • homophone: plainer
  • homophone: planer
  • rhymes with -eɪnə(ɹ)
  • CMU ARPABET: P L EY1 N ER0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Of or pertaining to a plane.

Definition source: English Wiktionary via Wiktextract

Examples

  • A planar projection of a three-dimensional object is its projection onto a plane.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

adj

Meaning 2

Flat, two-dimensional.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

adj

Meaning 3

Able to be embedded in the plane with no edges intersecting.

Definition source: English Wiktionary via Wiktextract

Topics: graph-theory, mathematics, sciences

Examples

  • A complete graph with more than four nodes is never planar.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adj

Meaning 4

Having a flat profile, not etched into a mesa.

Definition source: English Wiktionary via Wiktextract

Qualifier: transistor chip; semiconductor devices; transistor chip; semiconductor devices

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

adjective

Meaning 5

involving two dimensions

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: two-dimensional

Antonyms: cubic, linear

History

Etymology

From Late Latin plānārius (“relating to a plane”), derived from Latin plānus (“flat”, “level”), equivalent to plane + -ar, ultimately from Proto-Indo-European *pleh2- (“flat”).

Across languages

Translations

14 source translations are retained for this English entry.

  • Bulgarian: равнинен (ravninen) — of or pertaining to a plane
  • Czech: rovinný — of or pertaining to a plane
  • Czech: planární — of or pertaining to a plane
  • French: planaire — of or pertaining to a plane
  • Irish: plánach — of or pertaining to a plane
  • Italian: planare — of or pertaining to a plane
  • Romanian: planar — of or pertaining to a plane
  • Spanish: plano — of or pertaining to a plane
  • Turkish: düzlemsel — of or pertaining to a plane
  • Bulgarian: плосък (plosǎk) — flat, two-dimensional
  • Irish: plánach — flat, two-dimensional
  • Italian: planare — flat, two-dimensional
  • Māori: papatahi — flat, two-dimensional
  • Romanian: planar — flat, two-dimensional
Real reading context

planar in complete knowledge articles