nope, im referring to voice leading. Direct octaves and direct fifths mean that two voices, usually the soprano and bass, move in the same direction to the interval of an octave or a fifth.
The occurrence of direct octaves and fifths is avoided in common harmonic practice by using varied doublings where possible. One exception in the case of the direct octave is when the upper voice moves upward by a minor second in a leading tone capacity.
Not exactly the same as parallel octaves or fifths.
Musician, composer, teacher. I'm just going to guess you mean Perfect fifth and perfect octave (the eight note in a scale). The Perfect fifth is the fifth note in any scale. Almost certainly it's refering to the major or minor scale which are the same note for both the fifth or the Octave. If your in A then the perfect fifth is E and the perfect octave is A but an octave above the A you are playing. These are also the two most consonant notes towards eachother (A being the most consonant towards A and E being the second most consonant towards A) Bearcat is correct - two voices (usually the outer voices) moving in the same direction to an octave. Something like:
B - C (soprano, moving up)
G - C (bass, moving up) | 