rai·son d'ê·tre 
(rā′zōn dĕtrə, rĕ-zôɴ)
(rā′zōn dĕtrə, rĕ-zôɴ)n. pl. rai·sons d'être (rā′zōn, rĕ-zôɴ)
Reason or justification for existing.
[French : raison, reason + de, of, for + être, to be.]
- perpend
- perpendicular
- perpendicularity
- perpendicularly
- perpetrate
- perpetration
- perpetrator
- perpetual
- perpetual calendar
- perpetually
- perpetual motion
- perpetuance
- perpetuate
- perpetuation
- perpetuator
- perpetuity
- perphenazine
- Perpignan
- perplex
- perplexed
- perplexedly
- perplexingly
- perplexity
- perp walk
- perquisite