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11th letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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. It is a usual symbol for a voiceless velar stop, as in the English cook. It corresponds to Greek kappa. In chemistry K is the symbol for the element potassiumpotassium
, a metallic chemical element; symbol K [Lat. kalium=alkali]; at. no. 19; at. wt. 39.0983; m.p. 63.25°C;; b.p. 760°C;; sp. gr. .862 at 20°C;; valence +1.

Potassium is a soft, silver-white metal.
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(science and technology)
(computer science)


(computer science)


1. Prefix for kilo, indicating multiplication by 1000.
2. Symbol for “coefficient of thermal conductivity.”


1. Abbr. for key.
2.Abbr. for kip.
3. Abbr. for kitchen.
4.Symbol for “Kelvin.”

kelvin (K)

The International Standard unit of temperature. Absolute zero equals 0°K = -273.16°C = 459.69°F. A temperature increase of 1°K is numerically equal to an increase of 1°C.

kilo (k)

Prefix, used in the International System of Units, denoting multiplication by 1000.


. continually hindered from gaining entrance to mysterious castle. [Ger. Lit.: The Castle]


, K.
K?chel: indicating the serial number in the catalogue (1862) of the works of Mozart made by Ludwig von K?chel, (1800--1877)


kilo-, a kilobyte. Used both as a spoken word and a written suffix, like meg and gig for megabyte and gigabyte.

See prefix.


A unit of measurement of temperature. Part of the SI system of measurement, the Kelvin (K) scale starts at absolute zero (-273.15). Each Kelvin degree is the same as a Celsius degree. As a result, 0ºC (freezing water) is equal to 273.15K, and 100ºC (boiling water) is equal to 373.15K. From British physicist and mathematician Lord William Thomas Kelvin (1824-1907). See color temperature and SI units.


Thousand (10 to the 3rd power). Abbreviated "K." For technical specifications, it refers to the precise value 1,024 since computer specifications are based on binary numbers. For example, 64K means 65,536 bytes when referring to memory or storage (64x1024), but a 64K salary means $64,000. The IEEE uses "K" for 1,024, and "k" for 1,000. See KB, binary values and space/time.