over·breadth /ˌō-vər-'bredth, -'bretth; 'ō-vər-ˌ/ n
1: the quality or state of being overbroad
a statute void for overbreadth
2: a doctrine in constitutional law: a law that prohibits protected conduct (as free speech) as part of its reach may be struck down as unconstitutional if the threat to protected activity is a substantial effect and if it cannot be clearly removed; also: a doctrine allowing a defendant accused of unprotected conduct to challenge a law for overbreadth esp. in the area of free speech
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.