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• k
  k

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

  abbreviation

  carrying capacity.
• k.
  k.

  abbreviation

  capacity.
• K.
  K.

  abbreviation

  kip; kips.

k

¹ American  

Symbol.

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

2. Boltzmann constant.

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K ² American  

abbreviation

Ecology.

1. carrying capacity.

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K ³ American  

[key] / keɪ /

Or k

noun

K's, plural Ks, plural k's, plural ks plural

1. the eleventh letter of the English alphabet, a consonant.

2. any sound represented by the letter K or k, as in bilk, kit, or sick.

3. something having the shape of a K .

4. a written or printed representation of the letter K or k.

5. a device, as a printer's type, for reproducing the letter K or k.

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K ⁴ American  

abbreviation

1. the number 1000.

   The salary offered is $20K.

2. kilometer, especially in a footrace or wheelchair race on a road or track.

   She’s training to run her first 10K this summer.

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K ⁵ American  

abbreviation

1. Chess. king.

2. Physics. Kelvin.

3. Music. Köchel listing.

4. kindergarten.

   a K–12 boarding school.

5. Real Estate. kitchen.

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K ⁶ American  

Symbol.

1. the eleventh in order or in a series.

2. Computers.

   1. the number 1024 or 2 10 .

      A binary 32K memory has 32,768 positions.

   2. kilobyte.

3. Baseball. strikeout; strikeouts.

4. Physics. kaon.

5. Biochemistry. lysine.

6. Chemistry. potassium.

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k. ⁷ American  

abbreviation

1. Electricity. capacity.

2. karat.

3. kilogram; kilograms.

4. Chess. king.

5. knight.

6. knot.

7. kopeck.

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K. ⁸ American  

abbreviation

1. kip; kips.

2. Knight.

3. kwacha.

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K ¹ British  

symbol

1. kelvin(s)

2. chess king

3. chem potassium

4. physics kaon

5. currency

   1. kina

   2. kip

   3. kopeck

   4. kwacha

   5. kyat

6. one thousand

7. computing

   1. a unit of 1024 words, bits, or bytes

   2. (not in technical usage) 1000

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abbreviation

1. Cambodia (international car registration)

k ² British  

/ keɪ /

noun

1. the 11th letter and 8th consonant of the modern English alphabet

2. a speech sound represented by this letter, usually a voiceless velar stop, as in kitten

3. See five Ks

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k ³ British  

symbol

1. kilo(s)

2. maths the unit vector along the z-axis

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K ⁴ British  

abbreviation

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

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Etymology

Origin of K⁴

Abbreviation of kilo- K ² for def. 1; abbreviation of kilometer ( def. ) K ² for def. 2

Origin of K⁶

K ⁴ def. 6 from German Kalium

Example Sentences

They also face Uzbekistan in Houston before concluding their Group K campaign against Colombia in Miami.

From BBC • May 19, 2026

Levi described being deeply shaken by his encounter with the book, and by the guilt that torments Josef K despite his innocence.

From The Wall Street Journal • May 15, 2026

The achievement surpasses the previous record of 48 qubits, which was also set by Jülich scientists in 2019 using Japan's K computer.

From Science Daily • May 11, 2026

County Metro board will vote this week on a K Line extension that would connect West Hollywood, the Grove and Cedars-Sinai, creating a major north-south transit link.

From Los Angeles Times • May 8, 2026

If someone had trouble spelling a word, that person asked Miss K about it.

From "Ralph S. Mouse" by Beverly Cleary