M'Naughten rule
n. a traditional "right and wrong" test of legal insanity in criminal prosecutions. Under M'Naughten (its name comes from the trial of a notorious English assassin in the early 1800s), a defendant is legally insane if he/she cannot distingu ...

M. O.
n. slang for modus operandi, the way or pattern in which a repeat criminal usually commits his/her crime. See also: modus operandi.

magistrate
n. 1) a generic term for any judge of a court, or anyone officially performing a judge's functions. 2) in a few states, an officer of the court at the lowest level who hears small claims lawsuits,

Magna Carta
n. Latin for "Great Charter," it was a document delineating a series of laws establishing the rights of English barons and major landowners and limiting the absolute authority of the King of England.

mail box rule
n. in contract law, making a written offer or acceptance of offer valid if sent in the mail, with postage, within the time in which the offer must be accepted, unless the offer requires acceptance by personal delivery on or before the specified date.

maim
v. to inflict a serious bodily injury, including mutilation or any harm which limits the victim's ability to function physically. Originally, in English common law it meant to cut off or permanently cripple a body part like an arm, leg, hand or foot. ...

majority
n. 1) the age when a person can exercise all normal legal rights, including contracting and voting. It is 18 for most purposes, but there are rights such as drinking alcoholic beverages which is set at 21.