musica system of naming the notes of a scale by syllables instead of letters derived from the 11th-century hexachord system of Guido d'Arezzo, which assigns the names ut (or do), re, mi, fa, sol, la, si (or ti) to the degrees of the major scale of C (fixed system) or (excluding the syllables ut and si) to the major scale in any key (movable system)See also tonic sol-fa
Word Origin for solmization
C18: from French solmisation, from solmiser to use the sol-fa syllables, from sol1 + mi
"act of using certain syllables to name tones of a music scale," 1730, from French solmisation, from solmiser, from sol + mi, two of the syllables so used (see gamut).
