Harmonic usually refers to the frequency components of a time-varying signal, such as a musical note.

Look up harmonic in Wiktionary, the free dictionary.

• Harmonic (mathematics), a number of concepts in mathematics
• Harmonic analysis, representing signals by superposition of basic waves
• Harmonic oscillator, a concept in classical mechanics
• Simple harmonic motion, a concept in classical mechanics
• Harmonic distortion, a measurement of signal distortion
• Harmonics (electrical power)
• Harmonic series (mathematics), a divergent infinite series
• Harmonic tremor, a rhythmic earthquake which may indicate volcanic activity

• String harmonic, a string instrument playing technique
• Artificial harmonic, a string instrument playing technique
• Enharmonic, a "spelling" issue in music
• Harmonic series (music), the series of overtones (or partials) present in a musical note, or the vibrational modes of a string or an air column
• Scale of harmonics, a musical scale based on harmonic nodes of a string
• The Harmonics, a rock a cappella group from Stanford University
• Harmony, the musical use of simultaneous pitches, or chords
• Inharmonicity, the degree of overtones' departure from integral multiples of the fundamental frequency
• Overtone, any resonant frequency higher than the fundamental frequency

• Harmonic (color), a relationship between three colors
• Harmonic Convergence, a New Age astrological term
• "Harmonics", the twelfth movement of Mike Oldfield's Tubular Bells 2003 album
• Harmonic Inc., a video infrastructure product company, headquartered in San Jose, California

• Harmonix, a video game development company

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