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).

Definition of si in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 3 definitions of si in English:

Si2

Syllabification: Si

symbol

The chemical element silicon.

Definition of si in:

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.

Definition of si in: