- The definition of amplitude refers to the length and width of waves, such as sound waves, as they move or vibrate.
How much a radio wave moves back and forth is an example of its amplitude.
amplitude definition by Webster's New World
- the quality of being ample or the amount or degree to which a thing extends
- an amount that is more than enough; abundance; fullness
- scope or breadth, as of mind
- the angular distance of a star from the true east or west point of the horizon, at the moment of its rising or setting
- the extreme range of a fluctuating quantity, as an alternating current or the swing of a pendulum, generally measured from the average or mean to the extreme
Origin: Classical Latin amplitudo ; from amplus: see ample
amplitude definition by American Heritage Dictionary
- Greatness of size; magnitude.
- Fullness; copiousness.
- Breadth or range, as of intelligence.
- Astronomy The angular distance along the horizon from true east or west to the intersection of the vertical circle of a celestial body with the horizon.
- Physics The maximum absolute value of a periodically varying quantity.
- Mathematics a. The maximum absolute value of a periodic curve measured along its vertical axis.b. The angle made with the positive horizontal axis by the vector representation of a complex number.
- Electronics The maximum absolute value reached by a voltage or current waveform.
Origin: Latin amplitūdō, from amplus, large.
amplitude - Computer Definition
The extreme range, or magnitude, of a fluctuating value such as an acoustic or electromagnetic signal, amplitude is measured perpendicular to the to the time axis of a time-plot, i.e., frequency, of a sine wave. Amplitude is a measure of the intensity, loudness, power, strength, or volume level of a signal. In an electrical circuit operating on alternating current (ac), amplitude is measured as the Voltage (V) level and is expressed as +V and V, depending on the direction of the current. See also sine wave.
amplitude - Cultural Definition
amplitude - Science Definition
- Physics One half the full extent of a vibration, oscillation, or wave. The amplitude of an ocean wave is the maximum height of the wave crest above the level of calm water, or the maximum depth of the wave trough below the level of calm water. The amplitude of a pendulum swinging through an angle of 90° is 45°. Compare frequency.
- Electronics The amount by which a voltage or current changes from zero or an average value.