Pronunciation Noun

si (plural sis)

  1. (music) A syllable used in solfège to represent the seventh note of a major scale.
  • French: si
  • Italian: si
  • Portuguese: si
  • Russian: си
  • Spanish: si

Proper noun
  1. Initialism of Smithsonian Institution

si (uncountable)

  1. (electronics) Initialism of signal integrity
  2. (technology) Initialism of systems integration
  3. Initialism of self-injury
  4. (fandom slang) Initialism of self-insertion (of the author into fan fiction)
  5. Initialism of supporting information
  6. Initialism of special intelligence

si (not comparable)

  1. (anatomy, medicine) Initialism of sacroiliac
    SI joint

Pronunciation Proper noun
  1. A male given name.
  2. A male given name.
Pronunciation Proper noun
  1. (historical geography) Various prefectures of imperial China.
    Synonyms: Sizhou, Ssu, Ssu-chou

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