Atlantic time
Syllabification: (At·lan·tic time)
Definition of Atlantic time
- the standard time in a zone including the easternmost parts of mainland Canada, Puerto Rico, and the Virgin Islands, specifically.
- (Atlantic Standard Time, abbrev.: AST) standard time based on the mean solar time at the longitude 60° W, four hours behind GMT. (Atlantic Daylight Time, abbrev.: ADT) Atlantic time during daylight savings, three hours behind GMT.