Eigentones

Part of speech: noun

Definitions

1. Distinct natural frequencies at which an object or system naturally vibrates without external force; inherent musical tones that arise from the physical properties of instruments; fundamental frequency components characterizing resonant behavior
2. Specific vibration rates at which a structure oscillates freely when disturbed; original tonal qualities perceived in sound production; core sound frequencies reflecting inherent resonance traits of a medium or device
3. Natural resonant frequencies defining how an object spontaneously oscillates; primary intrinsic pitches produced in musical contexts; basic frequency modes fundamental to the acoustic signature of systems or materials

Etymology: The word is a plural, the form of "eigentone," so it is worth tracing both halves of the compound. The first part, "eigen-," is German for "own" or "proper," the same root that gives "eigen" in German usage for "characteristic" or "intrinsic," and it passed into English as a combining element. The second part, "tone," reaches back through Middle English and Latin "tonus" to ancient Greek "tónos," meaning a stretching or tension, the same idea that gave musicians the sense of pitch and sound quality. Put together, "eigentone" describes a sound a physical body produces by its own nature, the tone that belongs to it. That is why the plural refers to several such natural frequencies within one object, each one a distinct pitch the object rings at when left to itself.

Synonyms: natural frequencies, resonant frequencies, normal modes, eigenfrequencies