raison d'êtrerai‧son d'être /ˌreɪzɒn ˈdetrə $ -zoʊn-/ noun [singular] 
the reason why something exists, why someone does something etc: 
Commerce was the town’s raison d'être.
the reason why something exists, why someone does something etc: Commerce was the town’s raison d'être.- extrapolation
- extra-sensory perception
- extraterrestrial
- extraterritorial
- extra time
- extravagance
- extravagant
- extravagantly
- extravaganza
- extravert
- extra virgin
- extreme
- extreme fighting
- extremely
- extremis
- extremism
- extremist
- extremity
- extremophile
- extricate
- extrinsic
- extroversion
- extrovert
- extroverted
- extrude