n.
Pronunciation: ˌ s ə b-st ə - ' tü-sh ə n, - ' tyü-
Function: noun
Etymology: Middle English substitucion, from Middle French, from Late Latin substitution-, substitutio, from substituere
Date: 14th century
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
– sub · sti · tu · tion · al \ -shn ə l, -sh ə -n ə l \ adjective
– sub · sti · tu · tion · al · ly adverb
– sub · sti · tu · tion · ary \ -sh ə - ˌ ner- ē \ adjective