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  • Acoustics:
  1. A frequency that resonates in response to a fundamental (primary) frequency. Sometimes, when a certain frequency is generated (a fundamental), it will also cause another frequency or frequencies to start as well. These are called harmonics. Source: Church Audio & Acoustics Glossary
  2. Sinusoidal quantity that has a frequency which is an integral multiple of the fundamental. Source: Glossary of Terms in Noise Control Engineering
  • Electronics:
  1. A higher-frequency signal related to a fundamental signal by some multiple.

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