substitution
noun
sub·sti·tu·tion
ˌsəb-stə-ˈtü-shən
-ˈtyü-
1
a
: the act, process, or result of substituting one thing for another
b
: replacement of one mathematical entity by another of equal value
2
: one that is substituted for another
substitutionally
adverb
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Merriam-Webster unabridged
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