Standard Lemma guide

diameter

noun · 6 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.

  • Received-Pronunciation: /daɪˈæmɪtə(ɹ)/
  • General-American: dī-ăm'ĭtər
  • General-American: /daɪˈæmɪdɚ/
  • General-American: /daɪˈæmədɚ/
  • US: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: D AY0 AE1 M AH0 T ER0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

Any straight line between two points on the circumference of a circle that passes through the center of the circle; a chord that passes through the center of the circle.

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The length of such a line.

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

The maximum distance between any two points in a metric space.

Definition source: English Wiktionary via Wiktextract

Topics: geometry, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

The maximum eccentricity over all vertices in a graph.

Definition source: English Wiktionary via Wiktextract

Topics: graph-theory, mathematics, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

the length of a straight line passing through the center of a circle and connecting two points on the circumference

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: diam

Antonyms: none provided

Broader terms: length

Narrower terms: bore, gauge, caliber, calibre, windage

6

noun

Meaning 6

a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface)

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: straight line

History

Etymology

Etymology tree Proto-Indo-European *dwóh1 Proto-Indo-European *dwísder. Ancient Greek διά (diá) Ancient Greek δῐᾰ- (dĭă-) Proto-Indo-European *meh1- Proto-Indo-European *-tḗr Proto-Indo-European *-trom Proto-Hellenic *-tron Ancient Greek -τρον (-tron) Ancient Greek μέτρον (métron) Ancient Greek διάμετρος (diámetros)bor. Latin diametros Old French diametre English diameter From Old French diametre (French diamètre), from Latin diametros, from Ancient Greek διάμετρος (diámetros) (γραμμή (grammḗ)) (diametros grammē, “line measuring across”), from διά (diá, “across”) + μέτρον (métron, “measure”). By surface analysis, dia- + -meter.

Across languages

Translations

133 source translations are retained for this English entry.

  • Afrikaans: deursnee — line
  • Arabic: قُطْر (quṭr) — line
  • Armenian: տրամագիծ (tramagic) — line
  • Azerbaijani: diametr — line
  • Basque: diametro — line
  • Belarusian: дыя́метр (dyjámjetr) — line
  • Bengali: ব্যাস (bês) — line
  • Bulgarian: диаметър (diametǎr) — line
  • Catalan: diàmetre — line
  • Cebuano: latastid — line
  • Chinese Cantonese: 直徑 /直径 (zik6 ging3) — line
  • Chinese Mandarin: 直徑 /直径 (zhíjìng) — line
  • Czech: průměr — line
  • Danish: diameter — line
  • Danish: tværmål — line
  • Dutch: middellijn — line
  • Dutch: diameter — line
  • Esperanto: diametro — line
  • Estonian: diameeter — line
  • Faroese: tvørmál — line
  • Finnish: halkaisija — line
  • French: diamètre — line
  • Galician: diámetro — line
  • Georgian: დიამეტრი (diameṭri) — line
  • German: Durchmesser — line
  • German: Diameter — line
  • Greek: διάμετρος (diámetros) — line
  • Ancient Greek: διάμετρος (diámetros) — line
  • Gujarati: વ્યાસ (vyās) — line
  • Haitian Creole: dyamèt — line
  • Hebrew: קוטר (qot'er) — line
  • Hindi: व्यास (vyās) — line
  • Hungarian: átmérő — line
  • Icelandic: þvermál — line
  • Ido: diametro — line
  • Indonesian: diameter — line
  • Iquito: acajinacúraji — line
  • Irish: lárlíne — line
  • Italian: diametro — line
  • Japanese: 直径 (chokkei) — line
  • Kannada: ವ್ಯಾಸ (vyāsa) — line
  • Khmer: អង្កត់ផ្ចិត (ʼɑɑʼɑngkɑt phcət) — line
  • Korean: 지름 (jireum) — line
  • Central Kurdish: تیرە (tîre) — line
  • Northern Kurdish: tîre — line
  • Latin: diametros — line
  • Latvian: diametrs — line
  • Lithuanian: diametras — line
  • Luxembourgish: Duerchmiesser — line
  • Macedonian: дијаметар (dijametar) — line
  • Macedonian: пречник (prečnik) — line
  • Malay: garis pusat — line
  • Malay: diameter — line
  • Māori: whitianga — line
  • Marathi: व्यास (vyās) — line
  • Norwegian Bokmål: diameter — line
  • Norwegian Nynorsk: diameter — line
  • Persian: قطر (qotr) — line
  • Persian: ترامون (tarâmun) — line
  • Persian: گنج دوله (gonj-e dowle) — line
  • Persian: گنج (gonj) — line
  • Polish: średnica — line
  • Portuguese: diâmetro — line
  • Romagnol: diàmetar — line
  • Romanian: diametru — line
  • Russian: диа́метр (diámetr) — line
  • Russian: попере́чник (poperéčnik) — line
  • Serbo-Croatian: пречник — line
  • Serbo-Croatian: промјер — line
  • Serbo-Croatian: prečnik — line
  • Serbo-Croatian: promjer — line
  • Slovak: priemer — line
  • Slovene: premer — line
  • Spanish: diámetro — line
  • Swahili: kipenyo — line
  • Swedish: diameter — line
  • Tagalog: bantod — line
  • Tagalog: diyametro — line
  • Thai: เส้นผ่าศูนย์กลาง (sên-pàa-sǔun-glaang) — line
  • Thai: เส้นผ่านศูนย์กลาง (sen-phan-sun-klang) — line
  • Turkish: çap — line
  • Ukrainian: діа́метр (diámetr) — line
  • Ukrainian: попере́чник (poperéčnyk) — line
  • Urdu: قطر (qotr) — line
  • Vietnamese: đường kính — line
  • Walloon: diyamete — line
  • Welsh: diamedr — line
  • Yiddish: דיאַמעטער (dyameter) — line
  • Arabic: قُطْر (quṭr) — length of this line
  • Armenian: տրամագիծ (tramagic) — length of this line
  • Bengali: ব্যাস (bês) — length of this line
  • Catalan: diàmetre — length of this line
  • Chinese Cantonese: 直徑 /直径 (zik6 ging3) — length of this line
  • Chinese Mandarin: 直徑 /直径 (zhíjìng) — length of this line
  • Czech: průměr — length of this line
  • Danish: diameter — length of this line
  • Dutch: diameter — length of this line
  • Dutch: doorsnede — length of this line
  • Finnish: läpimitta — length of this line
  • French: diamètre — length of this line
  • Galician: diámetro — length of this line
  • German: Durchmesser — length of this line
  • German: Diameter — length of this line
  • Greek: διάμετρος (diámetros) — length of this line
  • Haitian Creole: dyamèt — length of this line
  • Hebrew: קוטר (qot'er) — length of this line
  • Hindi: व्यास (vyās) — length of this line
  • Irish: trastomhas — length of this line
  • Italian: diametro — length of this line
  • Japanese: 直径 (chokkei) — length of this line
  • Kannada: ವ್ಯಾಸ (vyāsa) — length of this line
  • Kannada: ವ್ಯಾಸದ ಉದ್ದ (vyāsada udda) — length of this line
  • Korean: 직경 (jikgyeong) — length of this line
  • Northern Kurdish: tîre — length of this line
  • Macedonian: дијаметар (dijametar) — length of this line
  • Macedonian: пречник (prečnik) — length of this line
  • Malay: garis pusat — length of this line
  • Malay: diameter — length of this line
  • Norwegian Bokmål: diameter — length of this line
  • Norwegian Nynorsk: diameter — length of this line
  • Polish: średnica — length of this line
  • Portuguese: diâmetro — length of this line
  • Russian: диа́метр (diámetr) — length of this line
  • Serbo-Croatian: пречник — length of this line
  • Serbo-Croatian: prečnik — length of this line
  • Spanish: diámetro — length of this line
  • Swahili: kipenyo — length of this line
  • Swedish: diameter — length of this line
  • Tagalog: bantod — length of this line
  • Tagalog: diyametro — length of this line
  • Walloon: diyamete — length of this line
  • Welsh: diamedr — length of this line
  • Italian: diametro — graph theory
Real reading context

diameter in complete knowledge articles