Definitions

1. proper noun

A title or name associated with a noble or aristocratic rank, especially in Canada.

“The Lord Frontenac was the governor of New France.”

2. proper noun

A county in the Canadian province of Ontario.

“The town of Kingston is located in Frontenac County.”

3. proper noun

A county in the U.S. state of Missouri.

“Frontenac is a city located in St. Louis County, Missouri.”