modus operàndi - mode of action.

modus vacàndi - a way of waiving the right.

modus vivèndi - a way of life, a temporary agreement [aiming at a temporary compromise settlement of any issue].

mutàtis mutàndis - with the replacement of what is to be replaced; taking into account the relevant differences; with changes resulting from circumstances; with the necessary changes.

nam sìlent lèges ìnter àrma - because laws are silent among weapons.

negotiorum gestio - managing other people's affairs without a mandate.

nemo dat qui non habet - he who does not have does not give.

nòlens volens - whether you want it or not.

nòmen jùris - legal concept, legal term.

non jurìdicus - not legal.