Noah Webster's New International Dictionary of the English Language

1. (a.) Feeling pain or sorrow on account of sins or offenses; repentant; contrite; sincerely affected by a sense of guilt, and resolved on amendment of life.

2. (a.) Doing penance.

3. (n.) One who repents of sin; one sorrowful on account of his transgressions.

4. (n.) One under church censure, but admitted to penance; one undergoing penance.

5. (n.) One under the direction of a confessor.