dual
/ˈdul/adjective, noun, verb
dual is spelled D-U-A-L: 4 letters and 2 syllables. It appears 19 times per million words in written English, the 4,444th most frequent word form (wordfreq, 2021 data). People search “dual vs duel” about 1,900 times a month (Google, United States). As an adjective, dual means “Characterized by having two (usually equivalent) components” (English Wiktionary, September 2026).
How many letters and syllables are in dual?
| Letters | 4: D-U-A-L |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | 19 times per million words; the 4,444th most frequent word form |
| Wrong spellings searched | none measured in search |
| Pairs people search | |
| Sounds like | |
| Rhymes with | |
| Same letters |
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); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is dual?
Dual appears 19 times per million words in written English, the 4,444th 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 dual?
- /ˈd͡ʒuː.əl/
- /ˈdjuː.əl/
- US /ˈdul/
Dual has 2 syllables (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: En-uk-dual.ogg, Wikimedia Commons (author and licence on each file's page).
Words people confuse with dual
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Sounds like: duel, jewel (Wiktionary's homophone list; some hold only in some accents).
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).
What rhymes with dual?
9 words on PlainSpell end in the same sounds as dual from its last stressed vowel (/ul/):
Spelled with the same letters in another order: auld, laud, udal.
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of dual
- du.
- duals plural, present, singular, he/she/it
- dualing US, participle, present
- dualling UK, participle, present
- dualed US, participle, past
- dualled UK, participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does dual mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Characterized by having two (usually equivalent) components.
a dual-motor vehicle
- 2
Pertaining to two, pertaining to a pair of.
dual engine failure
- 3
Pertaining to a grammatical number in certain languages that refers to two of something, such as a pair of shoes.
Modern Arabic displays a dual number, as did Homeric Greek.
- 4
Exhibiting duality.
- 5
Being the space of all linear functionals of (some other space).
- 6
Being the dual of some other category; containing the same objects but with source and target reversed for all morphisms.
noun
- 1
Of an item that is one of a pair, the other item in the pair.
- 2
Of a regular polyhedron with V vertices and F faces, the regular polyhedron having F vertices and V faces.
The octahedron is the dual of the cube. The icosahedron is the dual of the dodecahedron.
- 3
The dual number.
- 4
Of a vector in an inner product space, the linear functional corresponding to taking the inner product with that vector. The set of all duals is a vector space called the dual space.
- 5
A head-to-head match or meet between two teams, such as two high schools or colleges.
verb
- 1
To convert from single to dual; specifically, to convert a single-carriageway road to a dual carriageway.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate dual?
Wiktionary records one abbreviation of dual: du..
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Dual in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | double, duel, dual |
| Portuguese | dual , duplo |
| Spanish | dual |
| German | dual , Dual, Zweizahl |
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 dual come from?
Borrowed from Latin dualis (“two”), from duo (“two”) + adjective suffix -alis.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).