Meaning of ALTERNATE in English

ALTERNATE

( a. )

Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second; as, the alternate members 1, 3, 5, 7, etc. ; read every alternate line.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.