Pronunciation: (ir"i-den'tist),[key] —n. 1. (usually cap.) a member of an Italian association that became prominent in 1878, advocating the redemption, or the incorporation into Italy, of certain neighboring regions (Italia irredenta) having a primarily Italian population.
2. a member of a party in any country advocating the acquisition of some region included in another country by reason of cultural, historical, ethnic, racial, or other ties.
—adj. pertaining to or supporting such a party or its doctrine.