hidden octave
Both voices leap the same direction into an octave.
Both voices leaping the same direction into an octave. Like the hidden fifth, approaching a fused interval by similar motion weakens the sense of two separate lines, and it is watched most closely between the outer voices.
Learn it: Counterpoint
The one-sentence definition at the top is the same one the Theory Aide extension shows as a tooltip inside Ableton Live. Hover any dotted term for its own.