Origin: before 1150; Middle English prison, earlier prisun < Old French, variant of preson imprisonment, a prison < Latin pre(hē)nsiōn- (stem of prehēnsiō) a seizure, arrest, equivalent to prehēns(us) (past participle of prehendere to seize) + -iōn--ion; doublet of prehension
c.1123, from O.Fr. prisoun "prison, imprisonment" (11c.), altered (by influence of pris "taken;" see prize (2)) from earlier preson, from L. prensionem (nom. prensio), shortening of prehensionem (nom. *prehensio) "a taking," noun of action from pp. stem of prehendere "to take" (see