There are 3 definitions of si in English:

si1

Syllabification: si

noun

Music
another term for ti.

Origin

early 18th century: from the initial letters of Sancte Iohannes, the closing words of a Latin hymn (see solmization).

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Word of the day crowdsource
Pronunciation: ˈkraʊdsɔːs
verb
obtain (information) by enlisting help of many people…

There are 3 definitions of si in English:

Si2

Syllabification: Si

symbol

The chemical element silicon.

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There are 3 definitions of si in English:

SI3

Syllabification: SI

abbreviation

1The international system of units of measurement.
[from French Système International]
1.1 Law Statutory instrument.

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