Dictionary

SI en · PROPN · etymology 1

Etymology

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

Meanings

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

Deriveds

SI unit · SI prefix

SI en · ADJ · etymology 2

Meanings

1. (abbreviation, alt-of, initialism, not-comparable) Initialism of sacroiliac.
   alt of sacroiliac
   • SI joint

SI en · NOUN · etymology 2

Meanings

1. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of signal integrity.
   alt of signal integrity
2. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of systems integration.
   alt of systems integration
3. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of self-injury.
   alt of self-injury
4. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of suicidal ideation.
   alt of suicidal ideation
5. (abbreviation, alt-of, countable, initialism, slang, uncountable) Initialism of self-insertion (of the author into fan fiction).
   alt of self-insertion
6. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of spark ignition.
   alt of spark ignition
7. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of supporting information.
   alt of supporting information
8. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of special intelligence.
   alt of special intelligence
9. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of systematic internaliser.
   alt of systematic internaliser
10. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of swarm intelligence.
    alt of swarm intelligence
11. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of synthetic intelligence.
    alt of synthetic intelligence
12. (Philippines, abbreviation, alt-of, countable, initialism, uncountable) Initialism of sales invoice.
    alt of sales invoice
13. (Australia, Canada, UK, abbreviation, alt-of, countable, initialism, uncountable) Initialism of statutory instrument.
    alt of statutory instrument
    • 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. 2016 December 15, Richard Kelly, Statutory Instruments, House of Commons Library Briefing Paper 6509, archived from the original on 07 Jan 2022, page 1:
14. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of subinspector (of police, etc).
    alt of subinspector
    • India's first transgender SI
15. (abbreviation, alt-of, countable, initialism, uncountable) Initialism of surface interval.
    alt of surface interval

Forms

Deriveds

SIer

SI en · PROPN · etymology 2

Meanings

1. (abbreviation, alt-of, initialism) Initialism of Smithsonian Institution.
   alt of Smithsonian Institution
2. (abbreviation, alt-of, initialism) Initialism of Sports Illustrated.
   alt of Sports Illustrated
   • “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. 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: