don; plural noun: dons; noun: Don
a university teacher, especially a senior member of a college at Oxford or Cambridge.
university teacher, (university) lecturer, fellow, professor, reader, lector, college tutor, academic scholar, egghead, senior common room,
a Spanish title prefixed to a male forename. / a Spanish gentleman.
NORTH AMERICAN – a high-ranking member of the Mafia.
Early 16th century (in don1 (sense 2 of the noun)): from Spanish, from Latin dominus ‘lord, master’.