The legal document stating the reasons for a judicial decision(noun)
WordNet. Princeton University. 2010.
Use "legal opinion" in a sentence
"The legal opinion as to heirlooms in The Eustace Diamonds was written for me by Charles Merewether, the present Member for Northampton."
"But if I see him personally and give it as my legal opinion that the fact of the crime’s being committed inside Rome on a day of triumph by a Roman citizen assassin outweighs Bomilcar’s noncitizen status — why, I think I can allay his fears."