To admit or acknowledge something reluctantly, typically something that one feels guilty or embarrassed about. He confessed to the crime after hours of questioning.
To declare or profess one's faith or allegiance, especially in a religious context. She confessed her faith in front of the congregation.
To reveal or disclose something personal or secret. He confessed his love for her during the dinner.
To hear the confession of (a penitent) as a priest or confessor. The priest confessed dozens of parishioners before the mass.