(~s)
If you refer to a long period of time as an ~, you mean that important events or great changes took place during it.
The birth of Christ was the beginning of a major ~ of world history.
N-COUNT: usu with supp
(~s)
If you refer to a long period of time as an ~, you mean that important events or great changes took place during it.
The birth of Christ was the beginning of a major ~ of world history.
N-COUNT: usu with supp
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012