is a French expression commonly used in English, meaning "reason for being" or "reason to be."
Raison d'être may refer to:
Music
Songs "Raison d'etre", by Asriel from the album Abyss "raison detre", by Japanese rock band Dir En Grey on the album Gauze "Raison d'etre", by Japanese rock band Nightmare used as opening theme of the anime Claymore "Raison d'etre", used as the ending theme of the Chobits anime by Japanese singer and voice actress Rie Tanaka "Raison d'etre", by British rock band Buzzcocks from the album A Different Kind of Tension "Raison d'etre～交差する宿命～", by Tomosuke Funaki under the alias Zektbach for the arcade game beatmania IIDX 17: Sirius "Raison d'etre~レーゾンデートル~", by Japanese singer Eve from the album Smile
Other uses in music Raison d'être (band), a Swedish dark-ambient-industrial-drone music project Raison D'être (album), by Australian jazz fusion guitarist Frank Gambale
Other uses Raison d'être, an American Ale brewed by Dogfish Head