Ecclesiastical Law Definition: Church law. Related Terms: Canon Law, Theocracy, Civil Law, Common Law Synonymous to canon law. The body of church-made law which binds only those persons which recognize it, usually only church officers, and based on aged and pedantic precepts of canon law.REFERENCES:Duhaime, Lloyd, Articuli Cleri Categories & Topics: Church & Religion Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!