›an event or period that is important because it represents a big change in how people do or think about something: a watershed for sth/sbThe buyout was hailed on Wall Street as a watershed for private equity.a watershed in sth/sbThe 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.
watershedadjective[before noun]›Last year witnessed a watershed change for American business.