ground rule

English Thesaurus

1. (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds (noun.communication)

hypernym	:	rule,
definition	:	directions that define the way a game or sport is to be conducted (noun.communication)

domain category	:	baseball, baseball game,
definition	:	a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs (noun.act)