A polyphonic composition, developed from a given theme or themes, according to strict contrapuntal rules. The theme is first given out by one voice or part, and then, while that pursues its way, it is repeated by another at the interval of a fifth or fourth, and so on, until all the parts have answered one by one, continuing their several melodies and interweaving them in one complex progressive whole, in which the theme is often lost and reappears.
- Music An imitative polyphonic composition in which a theme or themes are stated successively in all of the voices of the contrapuntal structure.
- Psychiatry A pathological amnesiac condition during which one is apparently conscious of one's actions but has no recollection of them after returning to a normal state. This condition, usually resulting from severe mental stress, may persist for as long as several months.