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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

Example Sentences

El cambio se reflejó en el campo en la NLDS, donde Sasaki atacó a los Phillies con un estilo que transmitía una actitud de «golpéeme si puede».

From Los Angeles Times • Oct. 10, 2025

Los jugadores más valiosos no se eligen para la serie de la ronda divisional, pero si se hiciera, Sasaki probablemente habría ganado el premio.

From Los Angeles Times • Oct. 10, 2025

Jesus showed himself to the disciples, In quel tempo, quando si fu manifesta -

From BBC • Apr. 25, 2025

Para muchos investigadores, la gran pregunta es si, de ser electa, Sheinbaum Pardo continuará, revisará, o incluso revertirá las impopulares políticas relacionadas con la ciencia de su mentor.

From Science Magazine • May 8, 2024

When she’d ask, I’d tell her, “Si, si, Papi is up in the mountains fighting for a better world.”

From "In the Time of the Butterflies" by Julia Alvarez