si

¹

[ see ]

noun

, Music.

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

Si

²

Symbol, Chemistry.

1. silicon.

SI

³

abbreviation for

1. International System of Units.

S.I.

⁴

abbreviation for

1. Sandwich Islands.
2. Staten Island.

SI

¹

symbol for

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

abbreviation for

1. South Island

Si

²

the chemical symbol for

1. silicon

si

³

the internet domain name for

1. Slovenia

Si

⁴

/ ʃiː /

noun

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

si

⁵

/ siː /

noun

1. See te
   music a variant of te

Word History and Origins

Origin of si¹

First recorded in 1720–30; gamut

Example Sentences

Last question: Who do you think is the sexiest SI swimsuit model of all time?

From The Daily Beast

Except for nine of them are musical words: do, re, mi, fa, so, la, ti—and si—are musical.

From The Daily Beast

Michael Sam has one big advantage over the aging NFL execs who whined to SI.

From The Daily Beast

It was the only SI story Shrake ever wrote that the magazine would not print and Laguerre was embarrassed.

From The Daily Beast

Raymond Depardon: Un Moment Si Doux is on display at Grand Palais, Paris until February 10, 2014.

From The Daily Beast

Ils me respondirent que si je la voulois, ils me la donnoyent tout faict.

From Project Gutenberg

Il prenoit des symptomes si mortels, que souvent nous n'attendions sinon qu'il nous demeurast entre les mains.

From Project Gutenberg

De moi, je ne say qu'en dire, d'autant que je ne veux affirmer ny le si ny le non en ce dont je n'ay vidence.

From Project Gutenberg

La rougeur estoit si esclatante, que toute la rivire s'en teingnoit et en reluysoit.

From Project Gutenberg

Or ne say-je quelle estoit sa maladie; si elle venoit seulement par intervalles, ou non, je n'en say rien: tant y a que le 2.

From Project Gutenberg