round robin

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Sports A tournament in which each contestant is matched in turn against every other contestant.
• noun A petition or protest on which the signatures are arranged in a circle in order to conceal the order of signing.
• noun A letter sent among members of a group, often with comments added by each person in turn.

from The Century Dictionary.

• noun A pancake.
• noun A kind of ruff, apparently the smaller ruff of the latter part of the sixteenth century.
• noun Same as cigar-fish.
• noun The angler, Lophius piscatorius.
• noun A written paper, as a petition, memorial, or remonstrance, bearing a number of signatures arranged in a circular or concentric form.

from the GNU version of the Collaborative International Dictionary of English.

• noun Any series or sequence of actions.
• noun A document circulated from one person to another in a group, often with comments added by each recipient.
• noun A petition or similar document, in which the signatures are arranged in circular form in order to conceal the order of signing.
• noun (Sports) 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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A tournament in which every player or team competes against each of the others in turn.
• noun online gaming A method of dividing loot amongst a party of players by having the game assign in turn loot to a player or an enemy corpse to loot to a player.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a letter signed by a number of people
• noun a tournament in which every contestant plays every other contestant