An event marking a unique or important historical change of course or one on which important developments depend.
The agreement was a watershed in the history of both nations.
Juncture, Occasion - an event that occurs at a critical time.
Change - a different or fresh set of clothes; "she brought a change in her overnight bag".
Class, Course, Course Of Instruction, Course Of Study - education imparted in a series of lessons or meetings; "he took a course in basket weaving".
Bet, Calculate, Count, Depend, Look, Reckon - have faith or confidence in; "you can count on me to help you any time".
Event - something that happens at a given place and time.
Historic, Historical - belonging to the past; of what is important or famous in the past; "historic victories".
Crucial, Important - of extreme importance; vital to the resolution of a crisis; "a crucial moment in his career".
Marking - the act of making a visible mark on a surface.
On - in operation or operational; "left the oven on".
One - a single person or thing; "Do I say one thing, if you don`t mind ?".
Alone, Unequaled, Unequalled, Unique, Unparalleled - radically distinctive and without equal; "he is alone in the field of microbiology".
Which - interrogatively; "Which matter?".