Don (honorific) - Wikipedia
https://en.wikipedia.org/wiki/Don_(honorific)
Don (Spanish: , Italian: , Portuguese: Dom, from Latin dominus, roughly 'Lord'), abbreviated as D., is an honorific prefix primarily used in Spain and the former Spanish Empire, Croatia, Italy, and Portugal and its former colonies.. Don, and dom, is derived from the Latin Dominus: a master of a household, a title with background from the Roman Republic in classical antiquity.
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