1. a sequence or series.
2. a petition, remonstrance, or the like, having the signatures arranged in circular form so as to disguise the order of signing.
3. a letter, notice, or the like, circulated from person to person in a group, often with individual comments being added by each.
4. Sports.a tournament in which all of the entrants play each other at least once, failure to win a contest not resulting in elimination. Also,round'-rob'in.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.