1911 Encyclopædia Britannica/Chaconne
CHACONNE (Span. chacona), a slow dance, introduced into Spain by the Moors, now obsolete. It resembles the Passacaglia. The word is used also of the music composed for this dance—a slow stately movement in ¾ time. Such a movement was often introduced into a sonata, and formed the conventional finale to an opera or ballet until the time of Gluck.