ex pròprio vigòre - automatically, on your own.

constat - obviously, indisputably.

consentire vidètur qui tàcet - silence is a sign of consent.

consènsus fàcit jus - "agreement creates law", that is, the parties create a right for themselves through an agreement.

consensus omnium - joint agreement.

comitas gentium - international courtesy.

condìtio síne qua non - a necessary condition.

concèssio - gift, procedure.

compensàtio - offset of counterclaims.

commùnis scriptùra - joint document, contract.