SI

See also: Appendix:Variations of "si"

Translingual

Etymology 1

Borrowed from French SI (“Système international d'unités”).

Proper noun

SI

2. 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)

English

Etymology 1

Borrowed from French SI (“Système international d'unités”).

Proper noun

SI

1. International System of Units
   • 2018 November 13, Matthew Robinson and Lianne Kolirin, “The world has just redefined the kilogram”, in CNN‎^[1]:

     The reason for the change to the International System of Measurement (SI) units was that over time the prototype lost atoms and therefore mass because it is “susceptible to damage and environmental factors,” according to the National Physical Laboratory (NPL), which houses Kilo 18, Britain’s copy of Le Grand K.

Derived terms

• SI prefix
• SI unit

Etymology 2

Proper noun

SI

1. Initialism of Smithsonian Institution.
2. Initialism of Sports Illustrated.
   • 2024 March 18, Oliver Darcy and Liam Reilly, “Sports Illustrated to avert shutdown as it gets a fresh start under new publisher”, in CNN Business‎^[2]:

     “We have said from the start that our top priorities are to keep Sports Illustrated alive, uphold the legacy of the institution and protect our union jobs. We look forward to discussing a future with Minute Media that does that,” Emma Baccellieri, staff writer for SI and vice chair for the SI Union, said in a statement.

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. Initialism of suicidal ideation.
5. (fandom slang) Initialism of self-insertion (of the author into fan fiction).
6. (mechanical engineering) Initialism of spark ignition.
7. Initialism of supporting information.
8. Initialism of special intelligence.
9. (finance) Initialism of systematic internaliser.
10. Initialism of swarm intelligence.
11. Initialism of synthetic intelligence.
12. (Philippines, accounting, business) Initialism of sales invoice.
13. (UK, Canada, Australia, law) Initialism of statutory instrument.
    • 2016 December 15, Richard Kelly, Statutory Instruments‎^[3], House of Commons Library Briefing Paper 6509, archived from the original on 7 January 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.

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

    India's first transgender SI

15. (underwater diving) Initialism of surface interval.

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.

French

Pronunciation

• IPA^(key): /ɛ.si/ ~ /e.si/

• Audio:

  (file)

Proper noun

SI m

1. initialism of Système international: SI

Alternative forms

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

Indonesian

Pronunciation

• IPA^(key): /ˈɛs.i/

Proper noun

SI

1. (historical, politics) initialism of Sarekat Islam
2. (physics) initialism of Sistem Internasional (“International System of Units”)
3. initialism of Surveyor Indonesia

Noun

SI (plural SI-SI)

1. initialism of sarjana informatika
2. initialism of sistem informatika

Japanese

Etymology

Borrowed from English SI, from French SI (“Système international d'unités”).

Pronunciation

• (Tokyo) エスアイ [èsúáꜜì] (Nakadaka – [3])
• IPA^(key): [e̞sɨa̠i]

Noun

SI(エスアイ) • (esuai) 

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

Polish

Pronunciation

• IPA^(key): /ɛsˈi/
• Rhymes: -i
• Syllabification: S‧I

Noun

SI f (indeclinable)

1. initialism of sztuczna inteligencja

Portuguese

Proper noun

SI m

1. initialism of Sistema Internacional: SI

Spanish

Proper noun

SI m

1. abbreviation of Sinaloa: a state of Mexico