noun
the point at which the number of small changes over a period of time reaches a level where a further small change has a sudden and very great effect on a system or leads to an idea suddenly spreading quickly among a large number of people
noun
the point at which the number of small changes over a period of time reaches a level where a further small change has a sudden and very great effect on a system or leads to an idea suddenly spreading quickly among a large number of people
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005