(classical mechanics) A system which, when displaced from its equilibrium position, experiences a restoring force F proportional to the displacement x according to Hooke's law: F=-kx,, where k is a positive constant.

(linguistics, Optimality Theory) A situation where one input-to-output mapping pair receives a set of constraint violations that is a proper subset of the set of constraint violations received by a different input-output pair.

(number theory) Any of a series of numbers formed from the sum of the reciprocals of consecutive natural numbers

(geology) A rhythmic shaking of the ground detectable by a seismograph, and associated with volcanic activity. Often a symptomatic warning of an eruption.

plural of harmonic oscillator

plural of harmonic engine

(historical) A machine in which the energy of an electric current is used, by means of two small electromagnets, to keep up the vibrations of a large and heavily-weighted tuning fork whose arms are connected to two pistons working a miniature pump.

(jazz) A stressed note, deliberately incorrect. / (guitar) A barely thumb-muted pinch harmonic that does not completely deaden the fundamental note.

plural of harmonic function

plural of harmonic number