Amplitude is the concept of maximum displacement from equilibrium in an oscillating or wave system — a quantitative measure of the strength or intensity of a wave, signal, or periodic phenomenon. It applies to mechanical waves (sound, water), electromagnetic waves (light, radio), and abstract signals (electrical, data). Parameters: the equilibrium baseline, the peak displacement value, and the units of measurement (meters for mechanical, volts for electrical, decibels for acoustic intensity). The concept persists through mathematical formalism (Fourier analysis, differential equations), engineering practice (signal processing, acoustics, telecommunications), and physics education — enabling the precise description and manipulation of wave-based technologies from speakers to antennas to quantum wavefunctions. [formal: amplitude | substrate: behavior | horizon: a moment | explicit: yes | epoch: 0.01]
Accepted ontology entry
amplitude
Amplitude is the concept of maximum displacement from equilibrium in an oscillating or wave system — a quantitative measure of the strength or intensity of a wave, signal, or periodic phenomenon. It applies to mechanical waves (sound, wate…
Definition
Why it is in scope
A human-constructed concept for quantifying the magnitude of oscillation or displacement in wave, signal, and periodic systems — the measured extent of variation from equilibrium that characterizes the intensity or strength of a phenomenon.
Names and aliases
- amplitudeen · CANONICAL
Relations from this entry
- cmrc361dn0082a9g46bcbfpitINSTANCE_OF →
Amplitude is a specific kind of property — it is a measurable physical property describing the magnitude of a wave or oscillation. A competent speaker would call amplitude 'a property' of waves and signals.
- cmr9uz3vv00elhcxfruyltnd4INSTANCE_OF →
amplitude IS a specific kind of measurement: it quantifies the magnitude or strength of a signal — voltage, pressure, displacement, etc. A competent speaker in physics or audio engineering would call amplitude a type of measurement. Ladder: measurement is the nearest general kind.
Relations to this entry
- cmsovsk8p035cjlss3lkmq35i← DEPENDS_ON
Loudness is the perceptual magnitude of sound intensity, which is physically grounded in amplitude. Remove amplitude and loudness loses its physical referent — loudness IS the perception of amplitude variation. Object-level dependency: loudness operates by mapping amplitude to subjective intensity.
- cmsrl309o01svkp53moyzjhsw← DEPENDS_ON
Dynamic-range-compression measures signal amplitude to determine gain reduction. Remove amplitude as a concept and DRC loses its measurement target — it has nothing to compare against the threshold. The removal test passes: without amplitude, DRC cannot operate.
- cmsusi95500095bu4bgnn5ip6← DEPENDS_ON
RMS is a pure function of the signal's amplitude values: remove amplitude and there is nothing to square or average — the measure is undefined, not merely hard to compute. Constitutive input, in the same shape as spectral-energy's accepted dependency on its source quantity.
Record identity
- Created
- Aug 11, 2026, 4:59 PM UTC
- Content hash
- cb89c9720ea69438a611a03e2b328fd5d618fa4a676a880f2a432ead572428c6