c. 1300, from Old French emprisoner "imprison; be in prison" (12c.), from assimilated form of in- "in" (from PIE root *en "in") + prison (see prison). Formerly also emprison. Related: Imprisoned; imprisoning.
The suspects were imprisoned without trial
impressive
impressment
imprevisible
imprimatur
imprint
imprison
imprisonment
improbability
improbable
improbity
imprompt
