Real Dictionary

K
K or k is used as an abbreviation for words beginning with k, such as ' kilometre', 'kilobyte', or 'king'.
number: K or k is sometimes used to represent the number 1000, especially when referring to sums of money.
variable noun: K is the eleventh letter of the English alphabet.

k in American English
noun: the eleventh letter of the English alphabet, a consonant
symbol: a vector on the z-axis, having length 1 unit

K in American English 1
kilobyte
the eleventh letter of the English alphabet: from the Greek kappa, a borrowing from the Phoenician
abbreviation: king

K in American English 2
karat (carat)
symbol: the eleventh in order or in a series, or, when I is omitted, the tenth

K in American English 3
Boltzmann constant
capacity

k in British English
abbreviation for: Cambodia (international car registration)
abbreviation for: Köchel: indicating the serial number in the catalogue (1862) of the works of Mozart made by Ludwig von Köchel (1800–77)
noun: the 11th letter and 8th consonant of the modern English alphabet
symbol for: kelvin(s)
symbol for: kilo(s)

K- in British English
prefix: denoting or characteristic of the popular culture of South Korea

k. in American English
abbreviation: capacity
abbreviation: kip; kips