One of the mysteries of the English language finally explained.
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.
Forwards and in reverse. Chiefly with reference to the movement of a canon cancrizans.
Early 19th century. From classical Latin per per + recte and retro.
per recte et retro/pəː ˈrɛkteɪ ˌɛt ˈrɛtrəʊ/
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