private law
US /ˈpraɪ.vət lɔː/
UK /ˈpraɪ.vət lɔː/

1.
derecho privado
the branch of law that deals with the relations between individuals or institutions, rather than relations between these and the state.
:
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Contract law is a key area of private law.
El derecho contractual es un área clave del derecho privado.
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Family law falls under the umbrella of private law.
El derecho de familia se encuadra dentro del derecho privado.