Main Entry: sub·sti·tu·tion

Pronunciation: \ˌsəb-stə-ˈtü-shən, -ˈtyü-\

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 \-shnəl, -shə-n^əl\ adjective

— sub·sti·tu·tion·al·ly adverb

— sub·sti·tu·tion·ary \-shə-ˌner-ē\ adjective