watershed
noun [ S ]
uk/ˈwɔːtəʃed/ usan event or period that is important because it represents a big change in how people do or think about something:
a watershed for sth/sb The buyout was hailed on Wall Street as a watershed for private equity.
a watershed in sth/sb The pay agreement was a watershed in the development of the company's labour relations system.
the watershed
in Britain, the time in the evening, usually 9 pm, after which television programmes that are not suitable for children can be shown:
The script censors say which words can be used before the watershed.
watershed
adjective [ before noun ]
Last year witnessed a watershed change for American business.