Origin: 1350–1400;Middle English < Latinsubstitūtus (past participle of substituere to put in place of), equivalent to sub-sub- + -stitū-, combining form of statū-, past participle stem of statuere (see substituent) + -tus past participle suffix
1530s in transitive sense, 1888 as intransitive, from L. substitutus, pp. of substituere (see substitution). Related: Substituted; substituting. The noun is first attested c.1400; sports sense is from 1849.