ground rule

Definition of Ground Rule in English :

1. ground rule

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

WordNet Lexical Database for English. Princeton University. 2010.

Ground Rule

noun

a procedural rule or principle

1. Baseball

any of a set of rules adapted to playing conditions in a specific ballpark

2.

any of a set of rules governing a specific activity

n.

1. Sports A rule governing the playing of a game on a particular field, course, or court.

2. A basic rule of procedure or behavior.