ràtio lègis - motive for the law.
ratione contràctus - based on the contract.
ratiòne lòci - due to the circumstances connected with the place.
ratiòne privilègii - on the basis of privilege.
ràtio pèrtinens - pre-verbal argument.
ràtum - recognized as valid.
redùctio ad absùrdum - reduction to absurdity, absurd conclusion.
regùlae jùris - rules of law.
res commùnes - things that are common property.
res controversa - the subject of the dispute.