redom

1. one after another; in order; in a row
   Ulazite redom, jedan po jedan. — Come in one after another, one at a time.
   Učenici su redom čitali svoje sastave. — The pupils read their essays one after another.
2. all of them; without exception
   Na ispitu su redom padali. — They were failing the exam one and all.
   Redom su hvalili njenu tortu. — Everyone, without exception, praised her cake.

"Po redu" also means "in order", but it can additionally indicate ordinal position: treći po redu = the third in order.