(mathematics, physics) oscillating motion (as of a pendulum) in which the acceleration of the oscillator has an equal magnitude but opposite direction to the displacement of it from the equilibrium position

(harmonic analysis, representation theory, topology) A branch of harmonic analysis dealing with generalised Fourier transforms that act on functions defined on Hausdorff locally compact topological groups.

(music) a type of minor scale with the 3rd and 6th notes lowered by one semitone, with the interval pattern:

plural of harmonic minor scale

plural of non-harmonic tone

(music) a note that is played or sung between two chords that is not a part of either chord

plural of simple harmonic motion

a nonlinear optical process in which two photons with the same frequency interact with a nonlinear material

plural of second-harmonic generation

One of 77 counties in Oklahoma, United States. County seat: Hollis.