заблаговременно
Нареч. in (due/good) time, beforehand, in advance, ahead of time in good time; (заранее) beforehand, in advance; предупредить ~ warn in advance.
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Полный русско-английский словарь
на Gufo.me
Нареч. in (due/good) time, beforehand, in advance, ahead of time in good time; (заранее) beforehand, in advance; предупредить ~ warn in advance.