Main definitions of si in English

: si1Si2SI3

si1

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).

Pronunciation

si

/si//sē/

Main definitions of si in English

: si1Si2SI3

Si2

  • The chemical element silicon.

Main definitions of si in English

: si1Si2SI3

SI3

  • 1The international system of units of measurement.

  • 2Law
    Statutory instrument.

Pronunciation

SI

/ˌes ˈī//ˌɛs ˈaɪ/