K, k

[ key ]
/ keɪ /
|

noun, plural K's or Ks, k's or ks.

the eleventh letter of the English alphabet, a consonant.
any sound represented by the letter K or k, as in bilk, kit, or sick.
something having the shape of a K.
a written or printed representation of the letter K or k.
a device, as a printer's type, for reproducing the letter K or k.

k

Symbol.

Mathematics. a vector on the z-axis, having length 1 unit.

K

Ecology.

carrying capacity.

K

1

the number 1000: The salary offered is $20K.

Origin of K

1
abbreviation of kilo-

K

1

Symbol.

Chemistry. potassium.

Origin of K

1
From the New Latin word kalium

K

2

Chess. king.
Physics. Kelvin.
kindergarten: a K–12 boarding school.
Real Estate. kitchen.

K

2

Symbol.

the eleventh in order or in a series, or, when I is omitted, the tenth.
Computers.
  1. the number 1024 or 210: A binary 32K memory has 32,768 positions.
  2. kilobyte.
Baseball. strikeout; strikeouts.
Physics. kaon.
Biochemistry. lysine.

kk

or k

interjection Informal.

(used in text messages and other digital communications) okay; OK.

k.

K.

kip; kips.

kappa

[ kap-uh ]
/ ˈkæp ə /

noun

the tenth letter of the Greek alphabet (K, k).
the consonant sound represented by this letter.

Origin of kappa

< Greek káppa < Semitic; see kaph

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for k


British Dictionary definitions for k

k

K

/ (keɪ) /

noun plural k's, K's or Ks

the 11th letter and 8th consonant of the modern English alphabet
a speech sound represented by this letter, usually a voiceless velar stop, as in kitten

symbol for

kilo(s)
maths the unit vector along the z-axis

K

symbol for

abbreviation for

Cambodia (international car registration)

Word Origin for K

(for sense 3) from New Latin kalium; (for sense 6) from kilo-; (for sense 8) from Kampuchea

K

K.

abbreviation for

Köchel: indicating the serial number in the catalogue (1862) of the works of Mozart made by Ludwig von Köchel (1800–77)

kappa

/ (ˈkæpə) /

noun

the tenth letter in the Greek alphabet (Κ, κ), a consonant, transliterated as c or k

Word Origin for kappa

Greek, of Semitic origin

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for k
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for k

kappa

[ kăpə ]

n.

The tenth letter of the Greek alphabet.

adj.

Relating to or characterizing a polypeptide chain that is one of two types of light chains present in immunoglobins.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for k

K

Abbreviation of kelvin
The symbol for potassium.

potassium

[ pə-tăsē-əm ]

K

A soft, highly reactive, silvery-white metallic element of the alkali group occurring in nature only in compounds. It is essential for the growth of plants and is used especially in fertilizers and soaps. Atomic number 19; atomic weight 39.098; melting point 63.65°C; boiling point 774°C; specific gravity 0.862; valence 1. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.