ground rule

Noun
  1. (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds (synset 107290528)
    referred to in: ball, baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
    is a type of: rule - directions that define the way a game or sport is to be conducted

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