Ket

Pronunciation

IPA: /kÉ›t/

Origin 1

From bra-ket notation invented by Paul Dirac.

Noun

ket

(plural kets)

(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 |...ã€‰.''A particular ket, say

|A\rangle, might be represented by a particular column vector. Its corresponding bra,

\langle A|

, would then be represented by the row vector which is the transpose conjugate of that column vector.''

Origin 2

Compare Icelandic kjÃ¶t ("flesh"); akin to Swedish kÃ¶tt and Danish kjÃ¶d. 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.

Full definition of ket

Noun

ket

(plural kets)

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

Origin 3

Abbreviation.

Noun

ket

(uncountable)

(colloquial) ketamine----