A process of modernization of the policies and institutions of the Roman Catholic Church, initiated by the Second Vatican Council (1962–5).
1960s; earliest use found in Life. From Italian aggiornamento process of revision or modernization, updating from aggiornare to fix a date for (a trial, hearing, etc.), to modernize, review, bring up to date (a book, opinion, custom, etc.) + -mento, after French ajournement.