Substitute
late Middle English (denoting a deputy or delegate): from Latin substitutus ‘put in place of’, past participle of substituere, based on statuere ‘set up’.
wiktionary
From Middle English substituten, from Latin substitutus, past participle of substituō.
etymonline
substitute (v.)
early 15c. (transitive), from Latin substitutus, past participle of substituere "put in place of another" (see substitution). Transitive use is from 1888. Related: Substituted; substituting.
substitute (n.)
"one who acts in place of another," early 15c., from Old French substitut (noun use) and directly from Latin substitutus, past participle of substituere "put in place of another" (see substitution). Military draft sense is from 1777, American English. Team sports sense is from 1849. Of foodstuffs, from 1879. As an adjective from early 15c.
