Magister rerum usus; magistra rerum experientia – Use is the master of things; experience is the mistress of things.
Major continet in se minus – The greater contains the less.
Majus est delictum se ipsum occidere quam alium – It is a greater crime to kill one’s self than another.
Mala fide – In bad faith.
Mala grammatica non vitiat chartam – Bad grammar does not vitiate a deed.
Mala in se – Bad in themselves.
Mala prohibita – Crimes prohibited.
Malitia supplet aesatem – Malice supplies age.
Malo animo – With evil intent.
Mandamus – We command.
Maximus magister erroris populus est – The people are the greatest master of error.
Melior est conditio possidentis, ubi neuter jus habet – Better is the condition of the possessor where neither of the two has the right.
Melior testatoris in testamentis spectanda est – In wills the intention of a testator is to be regarded.
Meliorem conditionem suam facere potest minor deteriorem nequaquam – A minor can make his position better, never worse.
Mens rea – Guilty state of mind.
Mentiri est contra mentem ire – To lie is to act against the mind.
Merito beneficium legis amittit, qui legem ipsam subvertere intendit – He justly loses the benefit of the law who seeks to infringe the law.
Minatur innocentibus qui parcit nocentibus – He threatens the innocent who spares the guilty.
Misera est servitus, ubi jus est vagum aut incertum – It is a miserable slavery where the law is vague or uncertain.
Mors dicitur ultimum supplicium – Death is called the extreme penalty.
Muilta exercitatione facilius quam regulis percipies – You will perceive many things more easily by experience than by rules.