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1. pertaining to harmony, as distinguished from melody and rhythm. 2. marked by harmony; in harmony; concordant; consonant. 3. Physics. of, pertaining to, or noting a series of oscillations in which each oscillation has a frequency that is an integral multiple of the same basic frequency. 4. Mathematics. a. (of a set of values) related in a manner analogous to the frequencies of tones that are consonant. b. capable of being represented by sine and cosine functions. c. (of a function) satisfying the Laplace equation.
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