- Major continet in se minus – The greater contains the less.
- 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. A writ or order that is issued from a court of superior jurisdiction that commands an inferior tribunal/court to perform, or refrain from performing, a particular act, the performance of which is required by law as an obligation.
- Mansuetae naturae – Harmless or tame by nature.
- Maximus magister erroris populus est – The people are the greatest master of error.
- Mens rea – Guilty state of mind.
- Mesne profits – The rents and profits which a trespasser has received / made during his occupation of premises, which are lost to the actual owner.
- Mentiri est contra mentem ire – To lie is to act against the mind.
- Minatur innocentibus qui parcit nocentibus – He threatens the innocent who spares the guilty.
- Misnomer – A wrong or inaccurate name or term.
- M’ Naghten Rules – Rules which a judge applies in deciding if a person charged with a crime is insane.
- Mors dicitur ultimum supplicium – Death is called the extreme penalty.
- Modus Operandi – Method of working.
- Modus Vivendi – Way of living.
- Muilta exercitatione facilius quam regulis percipies – You will perceive many things more easily by experience than by rules.
- Mutatis Mutandis – The necessary changes.
