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# amplitude

[am-pli-tood, -tyood]
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noun
1. the state or quality of being ample, especially as to breadth or width; largeness; greatness of extent.
2. large or full measure; abundance; copiousness.
3. mental range, scope, or capacity.
4. Physics. the absolute value of the maximum displacement from a zero value during one period of an oscillation.
5. Electricity. the maximum deviation of an alternating current from its average value.
6. Astronomy. the arc of the horizon measured from the east or west point to the point where a vertical circle through a heavenly body would intersect the horizon.
7. Mathematics.

## Origin of .css-1fxfie5{font-size:22px;}@media (max-width:768px){.css-1fxfie5{font-size:18px;margin:0 10px 10px 0;word-break:break-all;word-wrap:break-word;-webkit-hyphens:auto;-moz-hyphens:auto;-ms-hyphens:auto;hyphens:auto;line-height:22px;}}amplitude

From the Latin word amplitūdō, dating back to 1540–50. See ample, -i-, -tude
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for amplitude

### Historical Examples

Pascal

John Tulloch

• #### This is called the amplitude and is indicated by the distance A-b.

Physics

Willis Eugene Tower

British Dictionary definitions for amplitude

# amplitude

noun
1. greatness of extent; magnitude
2. abundance or copiousness
3. breadth or scope, as of the mind
4. astronomy the angular distance along the horizon measured from true east or west to the point of intersection of the vertical circle passing through a celestial body
5. Also called: argument maths (of a complex number) the angle that the vector representing the complex number makes with the positive real axis. If the point (x, y) has polar coordinates (r, θ), the amplitude of x + i y is θ, that is, arctan y/xCompare modulus (def. 2) See also Argand diagram
6. physics the maximum variation from the zero or mean value of a periodically varying quantity

## Word Origin

C16: from Latin amplitūdō breadth, from amplus spacious
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Word Origin and History foramplitude

### n.

1540s, from Middle French amplitude or directly from Latin amplitudinem (nominative amplitudo) "wide extent, width," from amplus (see ample). Amplitude modulation in reference to radio wave broadcast (as opposed to frequency modulation) first attested 1921, usually abbreviated a.m.

Online Etymology Dictionary, © 2010 Douglas Harper

amplitude in Science

# amplitude

[ămplĭ-tōōd′]
1. 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.
2. Electronics The amount by which a voltage or current changes from zero or an average value.