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[moj-uh-luh s] /ˈmɒdʒ ə ləs/
noun, plural moduli
[moj-uh-ahy] /ˈmɒdʒ ə aɪ/ (Show IPA)
Physics. a coefficient pertaining to a physical property.
  1. that number by which the logarithms in one system are multiplied to yield the logarithms in another.
  2. a quantity by which two given quantities can be divided to yield the same remainders.
  3. absolute value.
Origin of modulus
1555-65; < Latin: a unit of measure; see mode1, -ule Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for modulus


noun (pl) -li (-ˌlaɪ)
(physics) a coefficient expressing a specified property of a specified substance See bulk modulus, modulus of rigidity, Young's modulus
(maths) the absolute value of a complex number See absolute value
(maths) the number by which a logarithm to one base is multiplied to give the corresponding logarithm to another base
(maths) an integer that can be divided exactly into the difference between two other integers: 7 is a modulus of 25 and 11 See also congruence (sense 2)
Word Origin
C16: from Latin, diminutive of modus measure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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modulus in Science
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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