(a) Clearance date means the date designated in each year by the Corporation and the Manager as the date by which vessels must report at the applicable calling in point referred to in § 401.97(c) for final transit of the Montreal-Lake Ontario Section of the Seaway;

(b) Closing date means the date designated in each year by the Corporation and the Manager as the date on which the Seaway is closed to vessels at the end of the navigation season;

(c) Closing period means the period that commences on the date designated in each year by the Corporation and the Manager as the date on which the closing procedures in § 401.97 apply and that ends on the closing date;

(d) Montreal-Lake Ontario Section of the Seaway means the portion of the Seaway between the Port of Montreal and mid-Lake Ontario;

(e) Wintering vessel means a vessel that enters the Seaway upbound after a date designated each year by the Corporation and the Manager and transits above Iroquois Lock.