regionary adjective 1noun 2forms 1 adjective1 •Of or pertaining to an ecclesiastical region.Not surprisingly, the regionary magistrates do not appear very often in the historians: not every aedile turned out like Vespasian. — 2013 noun2 •(historical) A catalogue of monuments and buildings in ancient Rome, produced from a survey. •(historical) Synonym of regionarius (“type of Roman Catholic ecclesiastic”). formsregionaries