SI

The word “SI” means in solfège, the syllable used for the seventh note of a major scale. In plain terms, the musical syllable for the seventh note of the scale, also written "ti.".

“SI” is pronounced see (/siː/ in IPA).

Here is “SI” used in a sentence: “The scale runs do, re, mi, fa, sol, la, si, do.”

Words with a similar meaning to “SI” include Sizhou and Ssu-chou.

“SI” is a noun.

The word “SI” comes from French. Borrowed from French, from the International System of Units abbreviation "SI.".

“SI” is a fairly common word in modern English.

In fixed-do and traditional solfège, "si" names the seventh note of the major scale, while movable-do systems used in English-speaking countries usually replace it with "ti." Both syllables refer to the same seventh scale degree, so they are simply different conventions for the same note.

The syllable "si" was changed to "ti" in movable-do teaching so that every solfège syllable begins with a different letter, which frees the letter "s" for "sol." "Si" remains standard in the fixed-do systems used in countries such as France, Italy, and Spain.

"Si" represents the seventh note of the major scale, the degree that sits just below the return to "do." In a fixed-do system it always corresponds to the pitch B, while in a movable-do system it shifts with the key.