watershed

Universal Words noun 1 [C] ~ (in sth) an event or a period of time that marks an important change: The middle decades of the 19th century marked a watershed in Russia's history. 2 [C] a line of high land where streams on one side flow into one river, and streams on the other side flow into a different river 3 (the watershed) [sing.] (in Britain) the time before which programmes that are not considered suitable for children may not be shown on television: Scenes like this should only be shown after the 9 o'clock watershed.