Jump To:

• 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.

---

Si ² American  

Symbol, Chemistry.

1. silicon.

---

SI ³ American  

abbreviation

1. International System of Units.

---

S.I. ⁴ American  

abbreviation

1. Sandwich Islands.

2. Staten Island.

---

SI ¹ British  

symbol

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

---

abbreviation

1. South Island

Si ² British  

/ ʃiː /

noun

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

---

Si ³ British  

symbol

1. silicon

---

si ⁴ British  

/ siː /

noun

1. music a variant of te

---

si ⁵ British  

abbreviation

1. Slovenia

---

Etymology

Origin of si

First recorded in 1720–30; see origin at gamut

---

Example Sentences

See Examples For:

si Si SI S.I.

That response went viral and now the phrase “¿Y si sí?” is chanted by Mexicans as they cheer on their national soccer team — a squad that boasts four wins without conceding a goal.

From Los Angeles Times ● Jul. 5, 2026

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

She claims she even uses words and mannerisms such as "mamma mia", "bambino" and "si" in conversation without realising it.

From BBC ● Dec. 22, 2024

So the crowd-pleasing sound world of Liszt returned one last time with “Enfant, si j’étais roi.”

From New York Times ● Sep. 8, 2022

Jo si ah Gitney Ihave not been able to divine entirely why Mr. Gitney called for a poIparty when he did.

From "The Astonishing Life of Octavian Nothing, Traitor to the Nation, Volume I: The Pox Party" by M.T. Anderson

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

Together with his brother Samuel Irving Newhouse Jr., known as Si, Donald oversaw and expanded the sprawling media company that was founded by their father more than a century ago.

From The Wall Street Journal ● May 27, 2026

Experts say "Magnifica Humanitas" could prove as influential as Pope Francis's "Laudato Si", a 2015 climate manifesto that triggered political and civic reactions worldwide.

From Barron's ● May 25, 2026

Princess Si Ling-chi was sitting under a mulberry tree when a silkworm cocoon fell into her teacup.

From "Middlesex: A Novel" by Jeffrey Eugenides

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

From Salon ● Oct. 8, 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

“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

The memorial itself holds a "tiered system of commemoration", says Korean research company 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

Both the Pollock and the Brancusi came from the estate of Condé Nast publisher S.I.

From The Wall Street Journal ● May 19, 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

But he also edited The New Yorker for five years before departing over “conceptual differences” with publisher S.I.

From Seattle Times ● Jun. 14, 2023

Solid sales but few fireworks for 16 paintings from the collection of Condé Nast’s former chairman, S.I.

From New York Times ● May 15, 2023

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

Random Word

Spin the wheel and learn a new word!

---