a 'weekly' paycheck [=the paycheck received every week]
I make 'weekly' trips to the grocery store.
We are paid 'weekly'. [=once every week]
(..) That's great. Here, you forgot my article. Excuse me, Mr. White. I was wondering... ...if you could arrange for half my salary... ...to be sent to this address on a weekly basis. Your bookie, right? My what? Don't tell me! He sends a check every week to his sweet, gray-haired mother. (..)1978 Superman