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| pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time |
| the analogous motion of the particles of a mass of air or the like, whose state of equilibrium has been disturbed, as in transmitting sound |
| harmonic motion | |
| —n | |
| See also simple harmonic motion a periodic motion in which the displacement is symmetrical about a point or a periodic motion that is composed of such motions | |
| harmonic motion
A periodic vibration, as of a violin string, in which the motions are symmetrical about a region of equilibrium. Such a vibration may have only one frequency and amplitude or may be a combination of two or more components called harmonics. Also called periodic motion. |