lux
/lʌks/noun
lux is spelled L-U-X: 3 letters and one syllable. It appears 2.1 times per million words in written English, the 18,811th most frequent word form (wordfreq, 2021 data). As a noun, lux means “In the International System of Units, the derived unit of illuminance or illumination; one lumen per square metre. Symbol: lx” (English Wiktionary, September 2026). The plural of lux is luxes; Wiktionary also lists luces (rare).
How many letters and syllables are in lux?
| Letters | 3: L-U-X |
|---|---|
| Syllables | 1 (from its American pronunciation) |
| In writing | 2.1 times per million words; the 18,811th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is lux?
Lux appears 2.1 times per million words in written English, the 18,811th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce lux?
- /lʌks/
Lux has one syllable (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-lux.wav, Wikimedia Commons (author and licence on each file's page).
Forms of lux
- luxes plural, present, singular, he/she/it
- luces plural, rare
- luxing participle, present
- luxed participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does lux mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
In the International System of Units, the derived unit of illuminance or illumination; one lumen per square metre. Symbol: lx
For quotations using this term, see Citations:lux.
verb
- 1
obsoleteTo dislocate; to luxate.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Lux in Spanish, French, German and Portuguese
In the sense the derived unit of illuminance:
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does lux come from?
Borrowed from Latin lūx (“light”), from Proto-Indo-European *lewk- (“white; light; bright”). Cognates include Ancient Greek λευκός (leukós, “white, blank, light, bright, clear”), Ancient Greek λύκη (lúkē, “light, morning twilight”), Sanskrit रोचते (rocate), Middle Persian 𐭩𐭥𐭬 (rōz, “day”) and Old English lēoht (noun) (English light).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).