n. An elaborate melody, particularly in vocal music and especially in operatic singing of the 18th and 19th centuries, with runs, trills, leaps, etc.
the GNU version of the Collaborative International Dictionary of English
n. Vocal music colored, as it were, by florid ornaments, runs, or rapid passages.
The Century Dictionary and Cyclopedia
n. A general term for runs, trills, and other florid decorations in vocal music, in which single syllables of the words are to be sung to two or more tones. Also called coloring.
Word Usage
"'colorature' singer of the latest style -- Madame Spatser"