substitution
/ (ˌsʌbstɪˈtjuːʃən) /
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noun
the act of substituting or state of being substituted
something or someone substituted
maths the replacement of a term of an equation by another that is known to have the same value in order to simplify the equation
maths logic
- the uniform replacement of one expression by another
- substitution instance an expression so derived from another
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Medical definitions for substitution
substitution
[ sŭb′stĭ-tōō′shən ]
n.
The replacement of an atom or group of atoms in a compound by another atom or group of atoms.
An unconscious defense mechanism by which the unacceptable or unattainable is replaced by something more acceptable or attainable.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.