adjoint
/ˈæd͡ʒ.ɔɪnt/adjective, noun
adjoint is spelled A-D-J-O-I-N-T: 7 letters. It appears about once in every 5 million words in written English, the 65,913th most frequent word form (wordfreq, 2021 data). As an adjective, adjoint means “Used in certain contexts, in each case involving a pair of transformations, one of which is, or is analogous to, conjugation (either inner…” (English Wiktionary, September 2026).
How many letters and syllables are in adjoint?
| Letters | 7: A-D-J-O-I-N-T |
|---|---|
| In writing | about once in every 5 million words; the 65,913th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is adjoint?
Adjoint appears about once in every 5 million words in written English, the 65,913th 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 adjoint?
- /ˈæd͡ʒ.ɔɪnt/
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-adjoint.wav, Wikimedia Commons (author and licence on each file's page).
Forms of adjoint
- adjoints plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does adjoint mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Used in certain contexts, in each case involving a pair of transformations, one of which is, or is analogous to, conjugation (either inner automorphism or complex conjugation).
- 2
That is related to another functor by an adjunction.
- 3
Having a relationship of the nature of an adjoint (adjoint curve); sharing multiple points with.
noun
- 1
The transpose of the cofactor matrix of a given square matrix.
- 2
Transpose conjugate.
- 3
Hermitian conjugate.
- 4
A functor related to another functor by an adjunction.
- 5
A curve A such that any point of a given curve C of multiplicity r has multiplicity at least r–1 on A. Sometimes the multiple points of C are required to be ordinary, and if this condition is not satisfied the term sub-adjoint is used.
- 6
An assistant to someone who holds a position in the military or civil service.
- 7
An assistant mayor of a French commune.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Adjoint in Spanish, French, German and Portuguese
In the sense matrix:
| Language | Words |
|---|---|
| German | adjungiert, Adjungierte |
| Spanish | adjunta, matriz de adjuntos, matriz de cofactores |
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 adjoint come from?
From French adjoindre (“to join”), from late 19th C; see also adjoin. Doublet of adjunct. In the case of category theory (which brings together concepts from numerous fields), the term is often confounded with adjunct and the relationship is called an adjunction. The origin of any particular usage may therefore be uncertain.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).