SI.
International System of Units
Meaning & usage
International System of Units
Where this word comes from
Borrowed from French SI (“Système international d'unités”).
Initialism of Smithsonian Institution.
Initialism of Sports Illustrated.
Initialism of signal integrity.
Initialism of systems integration.
Initialism of self-injury.
Initialism of suicidal ideation.
Initialism of self-insertion (of the author into fan fiction).
Initialism of spark ignition.
Initialism of supporting information.
Initialism of special intelligence.
Initialism of systematic internaliser.
Initialism of swarm intelligence.
Initialism of synthetic intelligence.
Initialism of sales invoice.
Initialism of statutory instrument.
Initialism of subinspector (of police, etc).
India's first transgender SI
Initialism of surface interval.
Initialism of sacroiliac.
SI joint
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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.