each alternate one (= the first, third, fifth, etc. one, but not the second, fourth, sixth, etc.) :
They visit us every other week.
each alternate one (= the first, third, fifth, etc. one, but not the second, fourth, sixth, etc.) :
They visit us every other week.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005