Noun | 1. | invalidation - (law) a formal termination (of a relationship or a judicial proceeding etc) breakup, dissolution - the termination or disintegration of a relationship (between persons or nations) dissolution of marriage - an annulment of a marriage law, jurisprudence - the collection of rules imposed by authority; "civilization presupposes respect for the law"; "the great problem for jurisprudence to allow freedom while enforcing order" |