Sentence:  A French "rondeau" from the "Roman de la Rose" (12th century) first establishes the triad, then turns to the seventh, but leaves it immediately to catch the octave, only to return in haste to the safer, wonted seventh. A similar example of uncertain <WSD>octavation</WSD> will be described in the following section on the Fate of Quartal and Quintal Patterns. 
Meaning of the word marked with <WSD> tags:  Transposition by an octave.