alternate · adjective /ˈɔːl.tər.nət/
alternate days/weeks/years, etc.
C1 one out of every two days, weeks, years, etc.
Dictionary example:
I work alternate Saturdays.
Learner example:
I had to go to a travel agency on alternate weekends in order to translate some programs into English. (Certificate in Advanced English; C1; Spanish)
alternate · verb /ˈɔːl.tər.neɪt/
alternate
C1 If two things alternate, one thing happens, then the other thing happens, then the first thing happens again, etc.
Dictionary example:
She alternates between cheerfulness and boredom.
Learner example:
Xanadu Express promises to serve us food from all over the world and to alternate [the] menu. (Certificate in Advanced English; C1; Turkish)