Definitions of solfege on the Web:

• solmization: singing using solfa syllables to denote the notes of the scale of C major
• a voice exercise; singing scales or runs to the same syllable
  wordnetweb.princeton.edu/perl/webwn

• Solfege|ソルフェージュ|Sorufeeju is a one-shot Japanese manga written and illustrated by Fumi Yoshinaga. The series is licensed and published in English in North America by Digital Manga Publishing.
  en.wikipedia.org/wiki/Solfege_(manga)

• In music, solfège (, also called solfeggio, sol-fa, or solfa) is a pedagogical solmization technique for the teaching of sight-singing in which ...
  en.wikipedia.org/wiki/Solfège

• a method of sight singing music that uses the syllables do (originally ut), re, mi, fa, sol (or so), la, and si (or ti) to represent the pitches of the scale, most commonly the major scale. ...
  en.wiktionary.org/wiki/solf%C3%A8ge

• Alternative spelling of solfège
  en.wiktionary.org/wiki/solfege

• A system that assigns syllables to the steps of the musical scale, useful in singing and ear-training. ...
  www.learner.org/series/cowl/glossary/musicalterms.html

• Italian system of pitch and interval ear training
  homelink.cps-k12.org/teachers/bakeand/files/32DCB1F0E16847D081C7674A29AAC0ED.doc