ket
/kɛt/
ket noun: a column vector, in Hilbert space, especially as representing the state of a quantum mechanical system; the complex conjugate transpose of a bra (a row vector); a ket vector. Symbolised by |...〉.
Noun (1)
ket (plural kets)
- A column vector, in Hilbert space, especially as representing the state of a quantum mechanical system; the complex conjugate transpose of a bra (a row vector); a ket vector. Symbolised by |...〉.
- A particular ket, say #124;A#92;rangle, might be represented by a particular column vector. Its corresponding bra, #92;langleA#124;, would then be represented by the row vector which is the transpose conjugate of that column vector.
Noun (2)
ket (countable and uncountable, plural kets)
Noun (3)
ket (uncountable)
Noun (4)
ket (uncountable)
Noun (5) capitalized: Ket
Ket (plural Kets or Ket)
- A member of a people of Krasnoyarsk Krai in Central Siberia, Russia.
Proper noun (1) capitalized: Ket
Ket
Noun (6) capitalized: Ket
Ket (plural Kets)
- A native or inhabitant of Brussels.
- Synonyms:
- Brusseler
Proper noun (2) capitalized: KET
KET
- The station code of Kennedy Town in Hong Kong.
Synonyms of ket
Antonyms
Forms of ket
| plural | kets |
|---|---|
| plural | Kets |
| plural | Ket |
Origin of ket
From bra-ket notation invented by Paul Dirac, from bracket.
Probably of Old Norse origin like kjǫt (“meat”), from Proto-Germanic *ketwą. Compare Icelandic kjöt (“flesh”); akin to Swedish kött, Danish kød, and Norwegian kjøtt. The use of the term ket for "candy" or "sweets" probably derived from its use to describe sweet meats or as a deterrent to children.
Clipping of ketamine.
Phrases with ket
Words that rhyme with ket
48 more rhymesFewer rhymes
- upset
- vignette
- whet
- sett
- cornet
- let
- manchette
- roulette
- yet
- cadet
- cassette
- collarette
- forget
- pet
- banquette
- met
- mignonette
- musette
- octet
- reset
- unset
- abet
- beget
- brunette
- cuvette
- debt
- dinette
- dudette
- duet
- minuet
- navette
- planchette
- quartet
- regret
- silhouette
- vinaigrette
- aid and abet
- amourette
- barrette
- bavette
- bet
- brett
- briquette
- corvette
- couchette
- enucleate
- fossette
- grisette
Questions about ket
- What does ket mean?
- Ket means a column vector, in Hilbert space, especially as representing the state of a quantum mechanical system; the complex conjugate transpose of a bra (a row vector); a ket vector. Symbolised by |...〉.
- What part of speech is ket?
- Ket can be a noun or a proper noun.
- How do you pronounce ket?
- Ket is pronounced /kɛt/.
- What is the plural of ket?
- The plural of ket is kets.
Words near ket in the dictionary
Source and license
Adapted from Wiktionary: ket (page history and authors); Ket (page history and authors); KET (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Vealhurl-ket.wav.
Cite this entry: “ket.” Word.ws, https://word.ws/ket. Based on Wiktionary, CC BY-SA 4.0.