Real Dictionary

confessional
adjective: A confessional speech or writing contains confessions.
countable noun: A confessional is the small room in a church where Christians, especially Roman Catholics, go to confess their sins.

confessional in American English
a small, enclosed place in a church, where a priest hears confessions
of, characterized by, or for a confession or confessions
adjective: of, pertaining to, characteristic of, or based on confession
noun: the place set apart for the hearing of confessions by a priest

confessional in British English
adjective: of, like, or suited to a confession
noun: a small stall, usually enclosed and divided by a screen or curtain, where a priest hears confessions