Substitute, v. t. [imp. & p. p. Substituted; p. pr. & vb. n. Substituting.]
Etymology: [See Substitute, n.]
To put in the place of another person or thing; to exchange. Some few verses are inserted or substituted in the room of others. Congreve.
1 other Webster entry under this spelling
Substitute, n.
One who, or that which, is substituted or put in the place of another; one who acts for another; that which stands in lieu of something else; specifically (Mil.),
a person who enlists for military service in the place of a conscript or drafted man. Hast thou not made me here thy substitute Milton. Ladies [in Shakespeare's age] . . . wore masks as the sole substitute known to our ancestors for the modern parasol. De Quincey.