n. — Finance
the interest rate on one-day loans to financial institutions as set by the Bank of Canada.
Bank rate has been preserved from British English. OED-3 defines the term as "the rate per cent. per annum fixed from time to time by the Bank of England, at which the company is prepared to discount bills of exchange having not more than 95 days to run" (see OED-3, s.v. "bank rate" [a]), and the Bank of England website gives the same definition for their Bank Rate as the Canadian meaning (see Bank of England reference).
See also COD-2, s.v. "bank rate", which is marked "esp. Cdn".