Don (honorific)
The terms Don (in Spanish and Italian), Dom (in Portuguese), and Domn (in Romanian), are honorific prefixes derived from the Latin Dominus, meaning "lord" or "owner". The honorific is commonly used in Spain, Portugal, and Italy, as well as in the Spanish-speaking world and Portuguese-speaking world, as well as some other places formerly colonized by Spain or Portugal. The feminine equivalents are Doña (Spanish: [ˈdoɲa]), Donna (Italian: [ˈdɔnna]), Doamnă (Romanian) and Dona (Portuguese: [ˈdonɐ]).
The term is derived from the Latin dominus: a master of a household, a title with background from the Roman Republic in classical antiquity. With the abbreviated form having emerged as such in the Middle Ages, traditionally it is reserved for Catholic clergy and nobles, in addition to certain educational authorities and persons of high distinction.