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Substitution

From Biology-Online Dictionary
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substitution

1. The act of putting one thing in the place of another, especially the chemical replacement of one element or radical by some other.

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.

Origin: L. Substitutio, from statuere = to place