substitution

substitution /sub·sti·tu·tion/ (sub?sti-too´shun)

1. the act of putting one thing in place of another, especially the chemical replacement of one atom or radical by another.

2. a defense mechanism, operating unconsciously, in which an unattainable or unacceptable goal, emotion, or object is replaced by one that is attainable or acceptable.

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sub·sti·tu·tion (sbst-tshn)

n.

1. The replacement of an atom or group of atoms in a compound by another atom or group of atoms.

2. An unconscious defense mechanism by which the unacceptable or unattainable is replaced by something more acceptable or attainable.

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substitution,

n a standard or nonstandard speech sound used for another consonant speech sound (e.g.,
w for
l wady for
lady]).

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substitution

the act of putting one thing in the place of another, especially the chemical replacement of one atom or substituent group by another.

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conservative substitution

in protein chemistry, one amino acid is substituted by another which has a similar polarity.

meat substitution

a common fraud in the meat industry in which uninspected meat is substituted for meat that has undergone inspection and been branded as satisfactory. The other not infrequent fraud is the substitution of meat of another species, e.g. horse for beef, cat for chicken or rabbit.

non-conservative substitution

in protein chemistry, one amino acid is substituted by another which has a markedly different polarity.