round-robin

 Any series or sequence of actions.  [PJC]

 A document circulated from one person to another in a group, often with comments added by each recipient.  [PJC]

 A petition or similar document, in which the signatures are arranged in circular form in order to conceal the order of signing.  [PJC]

 A tournament in which each contestant plays against every other contestant at least once; a failure to win any contest does not result in elimination from the tournament. Contrasted with elimination tournament  [PJC]