In law, a memorandum opinion is usually an unpublished legal opinion that cannot be cited as precedent. It is formally defined as: " unanimous appellate opinion that succinctly states the decision of the court; an opinion that briefly reports the court's conclusion, usu. without elaboration because the decision follows a well-established legal principle or does not relate to any point of law."  There is no elaboration or explanation because the decision either follows a well-known legal principle or it does not relate to a point of law. A memorandum opinion is also not subject to appeal.
|Judicial opinions & aggregates for official decisions (O.S-Federal)|
- "Memorandum Opinion Law & Legal Definition". Retrieved 15 March 2016.
- Black's Law Dictionary, 1201 (9th ed. 2009).
- Erica S. Weisgerber, 'Unpublished Opinions: A Convenient Means to an Unconstitutional End', Georgetown Law Journal, Volume 97, Number 2 (January 2009), p. 633