octavation

noun4

1. •
   Transposition by an octave.

   • I arranged ‘octavations’ which seemed to me to give the two movements greater elegance and litheness. — 1988
2. •
   (rare) Normalization of a numerical ratio by repeated multiplication or division by 2.

   • Energy is apparently transmuted by a series of octavations and that these octavations differentiate matter. — 1923
3. •
   Conversion (of the expression of a number) from denary to octal notation.

   • The inverse operation, which is termed “decimation,” together with an adequate treatment for the octavation of decimal fractions will be mentioned here without consideration of the details. — 1949
4. •
   (rare) The relationship between two planets that are distant from each other by one eighth of a great circle (45.625 degrees)

   • This octavation will be qualified (and perhaps rendered nil) if on a day when Uranus is well aspected its octave Mercury should be adversely aspected, or vice versa. — 1947