From Longman Dictionary of Contemporary EnglishJustice of the PeaceˌJustice of the ˈPeace noun [countable] SCT (abbreviation JP) someone who judges less serious cases in small law courts and, in the US, can perform marriage ceremonies
Examples from the Corpus
Justice of the Peace• During his remaining years here he continued to be active as a Justice of the Peace.• He has been a Justice of the Peace for 27 years.• He is a Justice of the Peace in Cardiff.From Longman Business Dictionaryjustice of the peaceˌjustice of the ˈpeace abbreviation JP noun (plural justices of the peace) [countable]LAW a MAGISTRATE (=type of judge) in Britain and in some US states who judges less serious cases in lower law courtsHe gave evidence before the Justice of the Peace. 