round robin

noun
1
a competition in which every player or team plays every other player or team
مسابقه دوره‌ای, تورنمنت همه‌جانبه
2
a letter intended to be read by many people that is copied and sent to each one
نامه گروهی, نامه زنجیره‌ای, نامه جمعی
I always send a round robin letter with all our news to friends at Christmas.
3
a letter that has been signed by a large number of people who wish to express their opinions about something
طومار دسته‌جمعی, نامه جمعی, نامه دسته‌جمعی, نامه با امضاهای جمعی, نامه با امضای گروهی
4
something that is made, written, etc. by several people who each add a part one after another
گردش حلقه‌ای, چرخش نوبتی, مشارکت نوبتی, سلسله گردشی
a round robin story