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Definition of si:

  1. A syllable applied, in solmization, to the note B; more recently, to the seventh tone of any major diatonic scale. It was added to Guido's scale by Le Maire about the end of the 17th century.


titanium, atomic number 52, Te, international system, Systeme International d'Unites, silicon, tellurium, Systeme International, atomic number 14, atomic number 22, Ti.

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