SI

See also: Appendix:Variations of "si"

Translingual

Etymology 1

Proper noun

SI

1. Système International d'Unités or the International System of Units, commonly known as the metric system.

   see Appendix on SI Units

Etymology 2

Symbol

SI

1. (international standards) ISO 3166-1 alpha-2 country code for Slovenia since 1992.

   Synonym: SVN (alpha-3)

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English

Proper noun

SI

1. Initialism of Smithsonian Institution.

Noun

SI (countable and uncountable, plural SIs)

1. (electronics) Initialism of signal integrity.
2. (technology) Initialism of systems integration.
3. Initialism of self-injury.
4. (fandom slang) Initialism of self-insertion. (of the author into fan fiction)
5. (mechanical engineering) Initialism of spark ignition.
6. Initialism of supporting information.
7. Initialism of special intelligence.
8. (finance) Initialism of systematic internaliser.
9. Initialism of swarm intelligence.
10. (UK, Canada, Australia, law) Initialism of statutory instrument.
    • 2016 December 15, Kelly, Richard, Statutory Instruments‎^[1], House of Commons Library Briefing Paper 6509, archived from the original on 7 January 2022, retrieved 9 February 2022, page 1:

      The scope of SIs varies greatly, from the technical (e.g. to set or vary the dates on which different provisions of an Act will come into force, to change the levels of fines or penalties for offences or to make consequential and transitional provisions) to the much wider-ranging, such as filling out the broad provisions in Acts.

11. Initialism of subinspector. (of police, etc)

    India's first transgender SI

Alternative forms

• S.I. (statutory instrument, chiefly in citation)

Adjective

SI (not comparable)

1. (anatomy, medicine) Initialism of sacroiliac.

   SI joint

Anagrams

• 'is, I's, IS, Is, i's, is, is-, is.

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French

Pronunciation

• IPA^(key): /ɛ.si/, /e.si/

• Audio

  (file)

Proper noun

SI m

1. Abbreviation of Système international. (Système international d'unités) (the international standard metric system)

Alternative forms

• S.I., S. I. (Système International d'Unités)

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Japanese

Etymology

From English SI, from French SI.

Pronunciation

• (Tokyo) エスア​イ [èsúáꜜì] (Nakadaka – [3])
• IPA^(key): [e̞sɨᵝa̠i]

Noun

S(エス)I(アイ) • (esuai) 

1. Synonym of 国際単位系 (Kokusai Tan'ikei, “International System of Units”); the SI

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Portuguese

Proper noun

SI m

1. Abbreviation of Sistema Internacional. SI

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Spanish

Proper noun

SI m

1. Abbreviation of Sinaloa. (Mexican state)