noun, plural moduli [moj-uh-ahy] .
Physics. a coefficient pertaining to a physical property.
that number by which the logarithms in one system are multiplied to yield the logarithms in another.
a quantity by which two given quantities can be divided to yield the same remainders.

1555–65; < Latin: a unit of measure; see mode1, -ule Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
modulus (ˈmɒdjʊləs)
n , pl -li
1.  physics bulk modulus modulus of rigidity See Young's modulus a coefficient expressing a specified property of a specified substance
2.  maths See absolute value the absolute value of a complex number
3.  maths the number by which a logarithm to one base is multiplied to give the corresponding logarithm to another base
4.  maths See also congruence an integer that can be divided exactly into the difference between two other integers: 7 is a modulus of 25 and 11
[C16: from Latin, diminutive of modus measure]

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American Heritage
Science Dictionary
modulus   (mŏj'ə-ləs)  Pronunciation Key 
Plural moduli (mŏj'ə-lī')
  1. A number by which two given numbers can be divided and produce the same remainder.

  2. The numerical length of the vector that represents a complex number. For a complex number a + bi, the modulus is the square root of (a2 + b2).

  3. The number by which a logarithm to one base must be multiplied to obtain the corresponding logarithm to another base.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Actual materials have been invented that have a negative modulus, they expand under pressure.
The modulus squares of the probability amplitudes determine the probabilities.
The modulus of subgrade reaction is directly proportional to the loaded area and inversely proportional to the deflection.
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