Definition of confiteor
: a liturgical form in which sinfulness is acknowledged and intercession for God's mercy requested
Origin and Etymology of confiteor
Middle English, from Latin, literally, I confess, from the opening words — more at confess
First Known Use: 13th century
Seen and Heard
What made you want to look up confiteor? Please tell us where you read or heard it (including the quote, if possible).