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# amplitude

[am-pli-tood, -tyood] /ˈæm plɪˌtud, -ˌtyud/
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, argument (def 8b).
Origin
1540-1550
1540-50; < Latin amplitūdō. See ample, -i-, -tude
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for amplitudes
• It was programmed by resetting gears and chains to adjust phasing and amplitudes.
British Dictionary definitions for amplitudes

## amplitude

/ˈæmplɪˌtjuːd/
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.
(maths) Also called argument. (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 + iy is θ, that is, arctan y/x Compare modulus (sense 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
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Word Origin and History for amplitudes

## amplitude

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
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amplitudes in Science
 amplitude   (ām'plĭ-td')    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.
The American Heritage® Science Dictionary
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amplitudes in Culture

### amplitude definition

In physics, the height of a crest (or the depth of a trough) of a wave.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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Encyclopedia Article for amplitudes

## amplitude

in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path. The amplitude of a pendulum is thus one-half the distance that the bob traverses in moving from one side to the other. Waves are generated by vibrating sources, their amplitude being proportional to the amplitude of the source

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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### Difficulty index for amplitude

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### Word Value for amplitudes

15
19
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