DCHP-1 Online
Lower Province Hist. 
from 1791-1841, the official name of the province lying between the Ottawa River and New Brunswick, now included in Quebec; from 1841-1867, the popular name for Canada East [see Lower Canada defs. 1a & 1b].
See also: Lower Canada (def. 1)
- 1791 (1866) The population of Upper Canada amounted to only ten thousand inhabitants, and that of the Lower Province to not more than a hundred thousand.
- 1852 (1923) I have been told a story of a lady in the Lower Province, who took for her second husband a young fellow, who, as far as his age was concerned, might have been her son.
- 1955 [The] Lower province . . . was not an attractive goal for British settlers.
- 1791 (1866) The population of Upper Canada amounted to only ten thousand inhabitants, and that of the Lower Province to not more than a hundred thousand.