Mathematics. = geometric, adj. 3.

Mathematics. = harmonic, adj. 5 †harmonical numbers: numbers in harmonic progression (obsolete).

Of, relating to, or involving progression (in various senses); progressing, progressive.

Mathematics. = harmonic, adj. 5a. Now historical.

Having equal differences; arithmetically proportional.

Mathematics. Applied to the relation of quantities whose reciprocals are in arithmetical progression (e.g. 1, 1/2, 1/3, 1/4,…); or to points, lines…

(a) adj. having a common harmonic relation; (b) n. a locus synharmonic with another.

Engineering and Science. Designating a set of numbers forming an approximate geometrical progression and taken as the officially recommended values…