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ISO.

The International Organization for Standardization.

3 characters2 syllables approx.English language

Meaning & usage

name/ˈaɪ.səʊ/Received-Pronunciation/ˈaɪ.ɛsˌəʊ/Received-Pronunciation/ˈaɪ.soʊ/General-American/ˈaɪ.ɛsˌoʊ/General-American
  1. The International Organization for Standardization.

Where this word comes from

Officially from Greek ίσος (ísos, “equal”). However, a participant in the initial meetings disputes this etymology, claiming that the link to ίσος was decided on after the name ISO was set. (file format): From the file extension, in reference to the ISO 9660 specification.

noun/ˈaɪ.səʊ/Received-Pronunciation/ˈaɪ.ɛsˌəʊ/Received-Pronunciation/ˈaɪ.soʊ/General-American/ˈaɪ.ɛsˌoʊ/General-American
  1. A disk image of an ISO 9660 file system (such as a CD or DVD).

    I downloaded the ISO but got an error when trying to burn it to disc.
  2. A measure of film sensitivity or brightness, derived from the ISO standard.

Where this word comes from

Officially from Greek ίσος (ísos, “equal”). However, a participant in the initial meetings disputes this etymology, claiming that the link to ίσος was decided on after the name ISO was set. (file format): From the file extension, in reference to the ISO 9660 specification.

noun
  1. Initialism of Imperial Service Order.

    abbreviation · alt-of · initialism
  2. Initialism of incentive stock option.

    abbreviation · alt-of · initialism
  3. Initialism of instrument-shaped object.

    abbreviation · alt-of · derogatory · initialism
  4. Initialism of information security officer.

    abbreviation · alt-of · initialism
prep
  1. Initialism of in search of.

    abbreviation · alt-of · initialism
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.