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Synonyms
sub·sti·tu·tion (sŭb́stĭ-tōṓshən, -tyōṓ-)

noun 

    1. The act or an instance of substituting.
    2. The state of being substituted.
  2. One that is substituted; a replacement.

derivatives

sub́sti·tútion·al
adjective
sub́sti·tútion·al·ly
adverb