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• kilo
  kilo

  noun

  kilogram.
• kilo-
  kilo-

  a Greek combining form meaning “thousand,” introduced from French in the nomenclature of the metric system (kiloliter ); on this model, used in the formation of compound words in other scientific measurements (kilowatt ).
• kilo–
  kilo–

  A prefix that means:

kilo

¹ American  

[kee-loh, kil-oh] / ˈki loʊ, ˈkɪl oʊ /

noun

kilos plural

1. kilogram.

2. kilometer.

3. (a word used in communications to represent the letterK. )

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kilo- ² American  

1. a Greek combining form meaning “thousand,” introduced from French in the nomenclature of the metric system (kiloliter ); on this model, used in the formation of compound words in other scientific measurements (kilowatt ).

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kilo ¹ British  

/ ˈkiːləʊ /

noun

1. communications a code word for the letter k

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kilo- ² British  

prefix

1.  k.  denoting 10³ (1000)

   kilometre

2. (in computer technology) denoting 2 ¹⁰ (1024): kilobyte: in computer usage, kilo- is restricted to sizes of storage (e.g. kilobit ) when it means 1024; in other computer contexts it retains its usual meaning of 1000

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kilo ³ British  

/ ˈkiːləʊ /

noun

1. short for kilogram kilometre

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kilo– Scientific  

1. A prefix that means:

2. One thousand, as in kilowatt, one thousand watts.

3. 2 ¹⁰ (that is, 1,024), which is the power of 2 closest to 1,000, as in kilobyte.

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Usage

What does kilo- mean? Kilo- is a combining form used like a prefix meaning “thousand.” It is often used in units of measure. Kilo- comes from Greek chī́lioi, meaning “a thousand.” The Latin translation of chī́lioi is mille, “a thousand,” which is the source of English terms such as millennium and millipede. To learn more, check out our entries for both words.

Other Word Forms

Inflected Forms

noun

• kilos
  plural

Etymology

Origin of kilo¹

First recorded in 1865–70; shortened form

Origin of kilo-²

< French, representing Greek chī́lioi a thousand

Example Sentences

Kilo was being exercised near Cairnie, Huntly, when he became unwell on Monday evening.

From BBC • Mar. 11, 2026

Beijing purchased 12 Kilo submarines from Russia, each equipped with highly-lethal Klub anti-ship missiles.

From Washington Times • Sep. 27, 2023

The Project 636 Varshavyanka submarines used in the drills are part of a Russian class of diesel-electric attack submarines, known in the West as the "improved Kilo class".

From Reuters • Apr. 25, 2023

He’d been living on the street for the last year, and this was the first time he’d had a chance to get medical care for Kilo or his other four-legged companions.

From Los Angeles Times • Jan. 18, 2023

Mrs. Stein, whose sole reading was the Bible and such advertising booklets as came by mail, or as she could pick up on the counter of the drugstore, when she went to Kilo, moved uneasily.

From Kilo : being the love story of Eliph' Hewlitt, book agent by Butler, Ellis Parker