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

Example Sentences

Se le preguntó a James si se habría imaginado un formato de Estados Unidos contra el mundo.

From Los Angeles Times • Feb. 15, 2026

Cuando le preguntaron si los aficionados del Citizens Bank Park se burlaban de él, respondió que no entendía lo que decían.

From Los Angeles Times • Oct. 10, 2025

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

Pero si es electa, promete aumentar el gasto público y privado en investigación.

From Science Magazine • May 8, 2024

“Ay, como nos haces sufrir. No se si maldecirte o por ti rezar.”

From "I Am Not Your Perfect Mexican Daughter" by Erika L. Sánchez