English
have reason
From have + reason, partly after Middle French avoir raison.
Proto-Indo-European *kap- ‘to seize’
Proto-Germanic *habjaną ‘to have, to hold’
Proto-West Germanic *habbjan ‘to have’
Old English habban ‘to have, possess’
Middle English haven ‘to own’
English have
Proto-Indo-European *h₂er- ‘to put together’
…
Latin ratus ‘considered’
Latin ratiō ‘reason’
Anglo-Norman raisun
Middle English resoun
English reason
Today it means
verb To be right.
Language periods are conventional ranges, not dates for this word.
Etymograph / have reason