Definition of per recte et retro in US English:

per recte et retro

adjective

Music
rare
  • Chiefly as a postpositive. Of a piece of music: containing a theme played both in the original form and in reverse; having the form of a canon cancrizans; written in this style.

adverb

Music
rare
  • Forwards and in reverse. Chiefly with reference to the movement of a canon cancrizans.

Origin

Early 19th century. From classical Latin per per + recte and retro.

Pronunciation

per recte et retro

/pəː ˈrɛkteɪ ˌɛt ˈrɛtrəʊ/