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• si
  si

  noun

  the syllable used for the seventh tone of a scale and sometimes for the tone B.
• Si
  Si

  silicon.
• SI
  SI

  abbreviation

  International System of Units.
• S.I.
  S.I.

  abbreviation

  Sandwich Islands.

si

¹ American  

[see] / si /

noun

Music.

1. the syllable used for the seventh tone of a scale and sometimes for the tone B.

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Si ² American  

Symbol, Chemistry.

1. silicon.

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SI ³ American  

abbreviation

1. International System of Units.

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S.I. ⁴ American  

abbreviation

1. Sandwich Islands.

2. Staten Island.

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SI ¹ British  

symbol

1. Système International (d'Unités) See SI unit

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abbreviation

1. South Island

Si ² British  

/ ʃiː /

noun

1. a variant transliteration of the Chinese name for the Xi

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Si ³ British  

symbol

1. silicon

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si ⁴ British  

/ siː /

noun

1. music a variant of te

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si ⁵ British  

abbreviation

1. Slovenia

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Etymology

Origin of si

First recorded in 1720–30; see origin at gamut

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Example Sentences

See Examples For:

si Si SI S.I.

It opens with a big-band cover of the 1920 standard “Whispering,” leading into the track, and closes with a reference to the 1947 French cabaret song “C’est si Bon.”

From The Wall Street Journal ● Jun. 15, 2026

In Spanish, Eso, si que es basically translates as "That's what it is!"

From Salon ● Nov. 8, 2021

It served home style Chinese dishes, like zha cai rou si mian — noodles with shredded pork and pickled mustard greens — as well as dishes his immigrant parents would not have recognized as Chinese.

From New York Times ● Jun. 21, 2021

Meanwhile his ever-growing fanbase - who christened themselves "sun si", or "mean fans" - voted for him repeatedly to ensure he remained in the show for weeks, grimacing and gyrating for their viewing pleasure.

From BBC ● May 5, 2021

“It’s called ‘Por si acaso no regreso,’ and it’s about Celia realizing she might never be able to see Cuba again.

From "Across So Many Seas" by Ruth Behar

I saved up and bought a red 1989 Honda CRX Si.

From Los Angeles Times ● Jun. 22, 2026

To test the theory, Fang and Si conducted laboratory experiments using a thin layer of water driven by electromagnetic forces.

From Science Daily ● Jun. 3, 2026

While Si was tied to the glitz and glamour of magazine business Condé Nast, Donald was a newspaper man at heart, known as a financially savvy publisher who respected his papers’ editorial independence.

From The Wall Street Journal ● May 27, 2026

The "Laudato Si" encyclical, which denounced mankind's ruthless exploitation of the environment, was hailed by experts for its scientific grounding.

From Barron's ● May 23, 2026

Purple Latin words stretched in a long ribbon beneath the seal: Si Quaeris Peninsulam Amoentrm Cir- cumspice.

From "Song of Solomon" by Toni Morrison

“I do like SI, because ‘artificial’ is not a very flattering thing.

From Salon ● Oct. 8, 2026

“The Task Force shall act as a coordinating body to ensure that the U.S. remains at the forefront of SI development while protecting the American people,” the task force charter states.

From The Wall Street Journal ● Oct. 3, 2026

Clayton will chair the “Super Intelligence Force” which takes President Trump’s preferred name for AI: super intelligence or SI.

From The Wall Street Journal ● Oct. 3, 2026

About 140 graves sit on the west side of the graveyard and 138 that sit on the opposite site, according to a satellite image taken in early April provided by SI Analytics.

From BBC ● May 7, 2026

Oct-ober SI “Did you give Tony my thank-you note?”

From "The Dead and the Gone" by Susan Beth Pfeffer

Newhouse maintained close ties to Syracuse, where his father made a donation in the 1960s to help establish what became known as the S.I.

From The Wall Street Journal ● May 27, 2026

According to a new survey titled “The American Journalist Under Attack,” released by Syracuse University’s S.I.

From Washington Times ● Dec. 30, 2023

According to a survey of TV news directors by Bob Papper, an adjunct professor at the S.I.

From New York Times ● Apr. 3, 2023

Among its other owners: contemporary art dealer Fred Mueller, who acquired it in the early ’70s, as well as S.I.

From Los Angeles Times ● May 9, 2022

This idea is favored by such prominent manufacturers as S.I.

From The New York Times Current History: the European War, February, 1915 by Various

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