parley vs round robin

parley

noun
  • A conference, especially one between enemies. 

verb
  • To have a discussion, especially one between enemies. 

round robin

noun
  • The part of a tournament in which every player or team competes against each of the others in turn. 

  • A form of bet on the full set of possible combinations from a larger group (of teams, racehorses, etc.), such as the outcomes A+B, B+C and A+C from a group ABC. 

  • A petition signed in a circular fashion to disguise the order in which it was done. 

  • 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. 

  • A form of trade, a series of exchanges in which each person in turn receives items of the same value from the previous person, finally returning to the original donor. For example in (philately) a stamp collector sends a packet of stamps to the next person on a list, who then takes the stamps he wants, replacing them with like-valued stamps, and then passing the packet to the next person on the list, until the packet ultimately returns to the original sender. 

  • A letter, with copies to multiple recipients, usually at Christmastime and often enclosed with a card, giving family news of interest to the sender. 

  • The MIDI technique of using different sampled versions of the same sound for successive notes, to avoid an unnaturally repetitive effect. 

  • A method of dividing labor between several similar subsystems, assigning tasks to each of them in turn in an attempt to use resources more equitably. 

How often have the words parley and round robin occurred in a corpus of books? (source: Google Ngram Viewer )