n. pl. — always plural, Geography
the Canadian provinces of Nova Scotia, New Brunswick, and Prince Edward Island.
Type: 3. Semantic Change — The adjective maritime has the general meaning of 'of or relating to the sea'. The term Maritimes has been adopted to collectively refer to the three Maritime provinces, due to their proximity to and cultural and economical ties to the Atlantic Ocean. Nova Scotia and New Brunswick were two of the four original provinces to enter Confederation in 1867, along with Ontario and Quebec. Prince Edward Island joined Canada in 1873. The term is most frequent in Canada (see Chart 1).
The Maritimes collectively cover just over 1% of Canada's land surface (133,850 km2, see Image 1), yet are historically and culturally of great importance to the nation of Canada. See also Canadian Encyclopedia, s.v. "Maritime Provinces".