Si Definition

noun
Ti.
American Heritage
Webster's New World
(music) A syllable used in solfège to represent the seventh note of a major scale.
Wiktionary
Synonyms:
abbreviation
Sirach (Ecclesiasticus)
Webster's New World
International System of weights and measures, using the metric system augmented by scientific units used in technology.
Webster's New World

The ccTLD for Slovenia as assigned by the IANA.

Wiktionary
symbol
Silicon.
Webster's New World
adverb
Yes.
Webster's New World
Yes.
Webster's New World

Origin of Si

  • Italian from Medieval Latin gamut

    From American Heritage Dictionary of the English Language, 5th Edition