He uses it in his discussion of a threat to Washington's first bid for re-election to the Colonial Era-Virginia House of Burgesses in 1761. That challenge came from a former fellow officer of Washington's from the French and Indian War, Adam Stephen. In the course of the campaign, Chernow writes:
Washington...castigated his quondam friend Stephen as "designing" and unprincipled.Quondam is a curiosity. But I think that it's an unnecessary word. Why use quondam when former or once will do?
