"SI" meaning in English

See SI in All languages combined, or Wiktionary

Adjective

Head templates: {{en-adj|-}} SI (not comparable)
  1. (anatomy, medicine) Initialism of sacroiliac. Tags: abbreviation, alt-of, initialism, not-comparable Alternative form of: sacroiliac
    Sense id: en-SI-en-adj-48qB~cSK Categories (other): Anatomy, Medicine Topics: anatomy, medicine, sciences
The following are not (yet) sense-disambiguated
Etymology number: 2

Proper name

Etymology: Borrowed from French SI (“Système international d'unités”). Etymology templates: {{bor+|en|fr|SI||Système international d'unités}} Borrowed from French SI (“Système international d'unités”) Head templates: {{en-prop}} SI
  1. International System of Units Derived forms: SI prefix, SI unit
    Sense id: en-SI-en-name-PFnriqgA Categories (other): Metric system Disambiguation of Metric system: 2 34 4 4 3 6 2 5 2 3 2 2 3 5 5 2 5 2 5
The following are not (yet) sense-disambiguated
Etymology number: 1

Proper name

Head templates: {{en-prop}} SI
  1. Initialism of Smithsonian Institution. Tags: abbreviation, alt-of, initialism Alternative form of: Smithsonian Institution
    Sense id: en-SI-en-name-RW5EcOgD
  2. Initialism of Sports Illustrated. Tags: abbreviation, alt-of, initialism Alternative form of: Sports Illustrated
    Sense id: en-SI-en-name-7ToiPwzd
The following are not (yet) sense-disambiguated
Etymology number: 2

Noun

Forms: SIs [plural], S.I. [alternative]
Head templates: {{en-noun|~}} SI (countable and uncountable, plural SIs)
  1. (electronics) Initialism of signal integrity. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: signal integrity
  2. (technology) Initialism of systems integration. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: systems integration
    Sense id: en-SI-en-noun-6VKjrqb7 Categories (other): Technology Topics: engineering, natural-sciences, physical-sciences, technology
  3. Initialism of self-injury. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: self-injury
    Sense id: en-SI-en-noun-pjlWxIEb
  4. Initialism of suicidal ideation. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: suicidal ideation
    Sense id: en-SI-en-noun-eFp88YPe Categories (other): Pages with 8 entries, Pages with entries, English entries with incorrect language header Disambiguation of Pages with 8 entries: 2 7 1 3 3 3 4 10 4 2 1 0 1 11 1 4 11 3 11 2 4 1 1 1 5 6 Disambiguation of Pages with entries: 1 8 1 1 2 3 5 12 4 2 0 0 0 12 0 4 12 3 12 1 4 1 1 1 5 6 Disambiguation of English entries with incorrect language header: 1 9 1 3 3 5 5 13 5 3 1 0 1 14 0 5 14 4 15
  5. (fandom slang) Initialism of self-insertion (of the author into fan fiction). Tags: abbreviation, alt-of, countable, initialism, slang, uncountable Alternative form of: self-insertion (extra: of the author into fan fiction)
    Sense id: en-SI-en-noun-mODochcj Categories (other): Fan fiction Disambiguation of Fan fiction: 2 3 3 2 2 2 2 3 55 1 1 1 1 3 3 3 6 1 3 Topics: lifestyle
  6. (mechanical engineering) Initialism of spark ignition. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: spark ignition
    Sense id: en-SI-en-noun-fplJq6OM Categories (other): Mechanical engineering Topics: engineering, mechanical, mechanical-engineering, natural-sciences, physical-sciences
  7. Initialism of supporting information. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: supporting information
    Sense id: en-SI-en-noun-aQ0uzvgH
  8. Initialism of special intelligence. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: special intelligence
    Sense id: en-SI-en-noun-7wok7z9m
  9. (finance) Initialism of systematic internaliser. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: systematic internaliser
    Sense id: en-SI-en-noun-Wz3JFAEX Categories (other): Finance Topics: business, finance
  10. Initialism of swarm intelligence. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: swarm intelligence
    Sense id: en-SI-en-noun-zEqICLSH Categories (other): Pages with 8 entries, Pages with entries, English entries with incorrect language header Disambiguation of Pages with 8 entries: 2 7 1 3 3 3 4 10 4 2 1 0 1 11 1 4 11 3 11 2 4 1 1 1 5 6 Disambiguation of Pages with entries: 1 8 1 1 2 3 5 12 4 2 0 0 0 12 0 4 12 3 12 1 4 1 1 1 5 6 Disambiguation of English entries with incorrect language header: 1 9 1 3 3 5 5 13 5 3 1 0 1 14 0 5 14 4 15
  11. Initialism of synthetic intelligence. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: synthetic intelligence
    Sense id: en-SI-en-noun-4C9GJ8Qh
  12. (Philippines, accounting, business) Initialism of sales invoice. Tags: Philippines, abbreviation, alt-of, countable, initialism, uncountable Alternative form of: sales invoice
    Sense id: en-SI-en-noun-MGzo7x2J Categories (other): Philippine English, Accounting, Business Topics: accounting, business, finance
  13. (UK, Canada, Australia, law) Initialism of statutory instrument. Tags: Australia, Canada, UK, abbreviation, alt-of, countable, initialism, uncountable Alternative form of: statutory instrument
    Sense id: en-SI-en-noun-U2~1C8Sd Categories (other): Australian English, British English, Canadian English, Law, Pages with 8 entries, Pages with entries, English entries with incorrect language header Disambiguation of Pages with 8 entries: 2 7 1 3 3 3 4 10 4 2 1 0 1 11 1 4 11 3 11 2 4 1 1 1 5 6 Disambiguation of Pages with entries: 1 8 1 1 2 3 5 12 4 2 0 0 0 12 0 4 12 3 12 1 4 1 1 1 5 6 Disambiguation of English entries with incorrect language header: 1 9 1 3 3 5 5 13 5 3 1 0 1 14 0 5 14 4 15 Topics: law
  14. Initialism of subinspector (of police, etc). Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: subinspector (extra: of police, etc)
    Sense id: en-SI-en-noun-v353nKAB
  15. (underwater diving) Initialism of surface interval. Tags: abbreviation, alt-of, countable, initialism, uncountable Alternative form of: surface interval
    Sense id: en-SI-en-noun-jjAa-vPV Categories (other): Underwater diving, Pages with 8 entries, Pages with entries, English entries with incorrect language header Disambiguation of Pages with 8 entries: 2 7 1 3 3 3 4 10 4 2 1 0 1 11 1 4 11 3 11 2 4 1 1 1 5 6 Disambiguation of Pages with entries: 1 8 1 1 2 3 5 12 4 2 0 0 0 12 0 4 12 3 12 1 4 1 1 1 5 6 Disambiguation of English entries with incorrect language header: 1 9 1 3 3 5 5 13 5 3 1 0 1 14 0 5 14 4 15 Topics: diving, hobbies, lifestyle, sports, underwater-diving
The following are not (yet) sense-disambiguated
Derived forms: SIer
Etymology number: 2

Inflected forms

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          "ref": "2018 November 13, Matthew Robinson and Lianne Kolirin, “The world has just redefined the kilogram”, in CNN:",
          "text": "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.",
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          "ref": "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:",
          "text": "“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.",
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        "(technology) Initialism of systems integration."
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          "_dis": "2 3 3 2 2 2 2 3 55 1 1 1 1 3 3 3 6 1 3",
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        "Initialism of supporting information."
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        "(finance) Initialism of systematic internaliser."
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          "ref": "2016 December 15, Richard Kelly, Statutory Instruments, House of Commons Library Briefing Paper 6509, archived from the original on 07 Jan 2022, page 1:",
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        "English initialisms"
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        "abbreviation",
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        "Initialism of spark ignition."
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        "(mechanical engineering) Initialism of spark ignition."
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        "Initialism of supporting information."
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        "Initialism of special intelligence."
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          "intelligence",
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        "Initialism of systematic internaliser."
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        "(finance) Initialism of systematic internaliser."
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        "initialism",
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        "business",
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        "Initialism of swarm intelligence."
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        "abbreviation",
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        "Initialism of synthetic intelligence."
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        "(underwater diving) Initialism of surface interval."
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        "alt-of",
        "initialism",
        "not-comparable"
      ],
      "topics": [
        "anatomy",
        "medicine",
        "sciences"
      ]
    }
  ],
  "word": "SI"
}

Download raw JSONL data for SI meaning in English (11.6kB)


This page is a part of the kaikki.org machine-readable English dictionary. This dictionary is based on structured data extracted on 2026-09-20 from the enwiktionary dump dated 2026-09-02 using wiktextract (d6fca27 and 65e1673). The data shown on this site has been post-processed and various details (e.g., extra categories) removed, some information disambiguated, and additional data merged from other sources. See the raw data download page for the unprocessed wiktextract data.

If you use this data in academic research, please cite Tatu Ylonen: Wiktextract: Wiktionary as Machine-Readable Structured Data, Proceedings of the 13th Conference on Language Resources and Evaluation (LREC), pp. 1317-1325, Marseille, 20-25 June 2022. Linking to the relevant page(s) under https://kaikki.org would also be greatly appreciated.