ground rule ground rose • grounds · · · Info · Definitions · Characters · · ground rule · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds. Synonyms: ground rule. · · Noun Definition 1 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 u latin small letter u U+0075