ket

• IPA^(key): /kɛt/
• Rhymes: -ɛt

From bra-ket notation invented by Paul Dirac, from bracket

ket (plural kets)

1. (physics) A vector, in Hilbert space, especially as representing the state of a quantum mechanical system; the complex conjugate of a bra; a ket vector. Symbolised by |...〉.

   A particular ket, say ${\displaystyle |A\rangle }$ , might be represented by a particular column vector. Its corresponding bra, ${\displaystyle \langle A|}$ , would then be represented by the row vector which is the transpose conjugate of that column vector.

Compare Icelandic kjöt (“flesh”); akin to Swedish kött and Danish kjöd. 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.

ket (plural kets)

1. (Northern England) Carrion; any filth.
2. (Northumbria) Sweetmeats.
3. (Geordie) A sweet, treat or candy.

• The Collaborative International Dictionary of English v.0.48 on DICT.org
• Northumberland Words, English Dialect Society, R. Oliver Heslop, 1893–4
• A Dictionary of North East Dialect, Bill Griffiths, 2005, Northumbria University Press, →ISBN
• A List of words and phrases in everyday use by the natives of Hetton-le-Hole in the County of Durham, F.M.T.Palgrave, English Dialect Society vol.74, 1896,

Abbreviation.

ket (uncountable)

1. (colloquial) ketamine

ket (uncountable)

1. (Scotland) matted wool

• IPA^(key): /ked/ before a vowel.
• IPA^(key): /ke/ before a consonant.

ket

1. not

   N'ouzon ket petra eo. — I don't know what it is.

Together with ne: ne ... ket. This is the same structure as French ne ... pas.

ket m (plural ketten, diminutive ketje n)

1. (Belgium, dialectal) a kid
2. (Belgium, dialectal) a young guy

• Ketnet

• (common) kjöt

• IPA^(key): /cʰɛːt/
• Rhymes: -ɛːt

ket n (genitive singular kets, no plural)

1. (regional, dated) meat

ket

1. and