Etymology
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substitution (n.)

late 14c., substitucion, "appointment of a subordinate or successor," from Old French substitucion, substitution or directly from Late Latin substitutionem (nominative substitutio) "a putting in place of (another)," noun of action from past-participle stem of Latin substituere "put in place of another, place under or next to, present, submit," from sub "under" (see sub-) + statuere "set up" (from PIE root *sta- "to stand, make or be firm," with derivatives meaning "place or thing that is standing").

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Definitions of substitution

substitution (n.)
an event in which one thing is substituted for another;
substitution (n.)
the act of putting one thing or person in the place of another: "he sent Smith in for Jones but the substitution came too late to help";
Synonyms: exchange / commutation
From wordnet.princeton.edu