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Noun: ground rule  grawnd rool
  1. (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds
    "The ground rule stated that any ball hit into the ivy-covered outfield wall would be a double"
     
  2. A basic principle or rule
    "One of the ground rules for the debate was that each candidate would have two minutes to respond"

Derived forms: ground rules

Type of: rule