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
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/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
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