Emily Dickinson Lexicon

SUB'STI-TUTE, n.

1. One person put in the place of another to answer the same purpose. A person may be a substitute with full powers to act for another in an office. Representatives in legislation are the substitutes of their constituents. The orthodox creed of Christians is that Christ died as the substitute of sinners.
2. One thing put in the place of another. If you have not one medicine, use another as its substitute.