Jisho

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Noun
1. ground rule
Wikipedia definition
2. Ground rulesIn baseball, ground rules are special rules particular to each baseball park (grounds) in which the game is played. Unlike the well-defined playing field of most other sports, the playing area of a baseball field extends to an outfield fence in fair territory and the stadium seating in foul territory.
Read “Ground rules” on English Wikipedia
Read “グラウンドルール” on Japanese Wikipedia
Read “Ground rules” on DBpedia

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