United StatesUnited KingdomCanadaAustraliainformalneutral
Having a relationship of sufficient familiarity that one may address the other person by their given (first) name rather than by a title or surname.
Indicating informality or a lack of social distance between two people in speech or behavior.
2.
United StatesUnited KingdomCanadaAustraliainformalcolloquial
A description of an organizational or social practice in which people use first names as the customary form of address, often implying relative equality or casualness.