communis opinio

communis opinio (k[schwa]-myoo-nis [schwa]-pin-ee-oh). [Latin “common opinion”] Hist. A generally accepted belief about a point of law. • If held unanimously by those learned in the law, this common belief had the force of law in classical Rome.

“Communis opinio is evidence of what the law is, — not where it is an opinion merely speculative and theoretical, floating in the minds of persons, but where it has been made the ground-work and substratum of practice.” 1 Alexander M. Burrill, A Law-Dictionary and Glossary 330 (2d ed. 1867) (quoting Lord Ellenborough).


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