k

from The American Heritage® Dictionary of the English Language, 5th Edition.

• abbreviation karat
• noun The 11th letter of the modern English alphabet.
• noun Any of the speech sounds represented by the letter k.
• noun The 11th in a series.
• noun Something shaped like the letter K.

from The Century Dictionary.

• The eleventh letter and eighth consonant of the English alphabet; the eleventh character also of the Phenician alphabet, from which it has come to us through the Latin and Greek.
• In chem., the symbol for potassium (NL. kalium).
• As an abbreviation: [lowercase] In meteorology, of cumulus (c being used for cirrus).
• Of king, knight, etc.: as, K. G., Knight of the Garter.
• Of
• In math., k is generally a constant coefficient. It is also a unit vector perpendicular to i and j.
• As a numeral in medieval use, 250.
• As an abbreviation: In electricity, of kathode (cathode, which see) and kathodic (cathodic).
• In mathematics: The Lemoine point in geometry.
• In mineralogy, the middle letter of the general symbol hkl, given to the face of a crystal in the system of Miller. See symbol, 7.
• In phys.: The symbol usually employed for moment of inertia. The letter K is used by some writers as a symbol of electrostatic capacity, but C is now almost universally adopted for this quantity.
• A symbol usually employed to designate magnetic susceptibility.
• A symbol for absolute temperature.

from the GNU version of the Collaborative International Dictionary of English.

• the eleventh letter of the English alphabet, is nonvocal consonant. The form and sound of the letter K are from the Latin, which used the letter but little except in the early period of the language. It came into the Latin from the Greek, which received it from a Phœnician source, the ultimate origin probably being Egyptian. Etymologically K is most nearly related to c, g, h (which see).

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The eleventh letter of the basic modern Latin alphabet.
• noun voiceless velar plosive.
• noun The eleventh letter of the English alphabet, called kay and written in the Latin script.
• noun The first letter of callsigns allocated to American broadcast television and radio stations west of the Mississippi river.
• noun The ordinal number eleventh, derived from this letter of the English alphabet, called kay and written in the Latin script.
• noun The eleventh letter of the English alphabet.
• noun computing A kilobyte (more formally KB or kB).
• noun colloquial kilometre or kilometres.
• noun colloquial thousand or thousands.
• noun The SI measurement value of 1,000
• abbreviation See K
• abbreviation colloquial, text messaging, Internet slang Abbreviation of okay. (Also spelled 'kay.)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a unit of information equal to 1024 bytes
• adjective denoting a quantity consisting of 1,000 items or units
• noun a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
• noun a unit of information equal to 1000 bytes
• noun the basic unit of thermodynamic temperature adopted under the Systeme International d'Unites
• noun the cardinal number that is the product of 10 and 100
• noun the 11th letter of the Roman alphabet
• noun street names for ketamine