(~s)
1.
If something such as an event is a ~ in the history or development of something, it is very important because it represents the beginning of a new stage in it.
The election of Mary Robinson in 1990 was a ~ in Irish politics...
= turning point
N-COUNT: usu sing, oft N in n
2.
The ~ is a time before which television broadcasters have agreed not to show programmes unsuitable for children, for example programmes that contain scenes of sex or violence. (BRIT)
The advert should only be shown after the 9pm ~.
N-COUNT: usu the N in sing