Standard Lemma guide

photon

noun · 2 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.

  • /ˈfəʊtɒn/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • rhymes with -əʊtɒn
  • CMU ARPABET: F OW1 T AA2 N Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.

Definition source: English Wiktionary via Wiktextract

Usage: particle

Topics: natural-sciences, physical-sciences, physics

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: gauge boson

History

Etymology

From photo- + -on. Coined by American physicist Leonard Troland in 1916 as a unit of light hitting the retina, and later popularized in a more modern sense by Gilbert N. Lewis, with the term gaining acceptance in the physics community by the late 1920s.

Across languages

Translations

74 source translations are retained for this English entry.

  • Arabic: فُوتُون (futūn) — quantum of light
  • Armenian: ֆոտոն (foton) — quantum of light
  • Asturian: fotón — quantum of light
  • Basque: fotoi — quantum of light
  • Belarusian: фато́н (fatón) — quantum of light
  • Bengali: ফোটন (phōṭon) — quantum of light
  • Bulgarian: фото́н (fotón) — quantum of light
  • Burmese: ဖိုတွန် (hpui-twan) — quantum of light
  • Catalan: fotó — quantum of light
  • Chinese: 光子 (kng chú) — quantum of light
  • Chinese Mandarin: 光子 (guāngzǐ) — quantum of light
  • Czech: foton — quantum of light
  • Danish: foton — quantum of light
  • Dutch: foton — quantum of light
  • Dutch: lichtdeeltje — quantum of light
  • Esperanto: fotono — quantum of light
  • Estonian: footon — quantum of light
  • Estonian: valguseosake — quantum of light
  • Finnish: fotoni — quantum of light
  • Finnish: valohiukkanen — quantum of light
  • Finnish: valokvantti — quantum of light
  • French: photon — quantum of light
  • Galician: fotón — quantum of light
  • Georgian: ფოტონი (poṭoni) — quantum of light
  • German: Photon — quantum of light
  • German: Lichtteilchen — quantum of light
  • Greek: φωτόνιο (fotónio) — quantum of light
  • Gujarati: પ્રકાશાણુ (prakāśāṇu) — quantum of light
  • Hebrew: פוטון — quantum of light
  • Hindi: प्रकाशाणु (prakāśāṇu) — quantum of light
  • Hindi: फ़ोटोन (foṭon) — quantum of light
  • Hungarian: foton — quantum of light
  • Icelandic: ljóseind — quantum of light
  • Icelandic: fótóna — quantum of light
  • Icelandic: ljósögn — quantum of light
  • Ido: fotono — quantum of light
  • Italian: fotone — quantum of light
  • Japanese: 光子 (kōshi) — quantum of light
  • Khmer: អាភាណូ (aaphie noo) — quantum of light
  • Korean: 광자 (gwangja) — quantum of light
  • Low German: Lichtdeelken — quantum of light
  • Macedonian: фотон (foton) — quantum of light
  • Malagasy: voan-kazavana — quantum of light
  • Malay: foton — quantum of light
  • Māori: pūaho — quantum of light
  • Marathi: प्रकाशाणू (prakāśāṇū) — quantum of light
  • Mongolian: фотон ᠹᠣᠲ᠋ᠣᠨ (foton) — quantum of light
  • Nepali: प्रकाशाणु (prakāśāṇu) — quantum of light
  • Norwegian: foton — quantum of light
  • Norwegian: lyskvant — quantum of light
  • Norwegian Bokmål: lyskvant — quantum of light
  • Norwegian Bokmål: foton — quantum of light
  • Norwegian Nynorsk: lyskvant — quantum of light
  • Norwegian Nynorsk: foton — quantum of light
  • Persian: فوتون (foton) — quantum of light
  • Polish: foton — quantum of light
  • Brazilian Portuguese: fóton — quantum of light
  • European Portuguese: fotão — quantum of light
  • Romanian: foton — quantum of light
  • Russian: фото́н (fotón) — quantum of light
  • Sanskrit: प्रकाशाणु (prakāśāṇu) — quantum of light
  • Serbo-Croatian: фо̀то̄н — quantum of light
  • Serbo-Croatian: fòtōn — quantum of light
  • Spanish: fotón — quantum of light
  • Swahili: fotoni — quantum of light
  • Swedish: foton — quantum of light
  • Tagalog: sugapik — quantum of light
  • Tamil: ஒளியன் (oḷiyaṉ) — quantum of light
  • Thai: โฟตอน (fohdton) — quantum of light
  • Turkish: foton — quantum of light
  • Ukrainian: фото́н (fotón) — quantum of light
  • Vietnamese: quang tử — quantum of light
  • Võro: foodon — quantum of light
  • Welsh: ffoton — quantum of light
Real reading context

photon in complete knowledge articles