'Right of nullification' definitions:

Definition of 'Right of nullification'

From: GCIDE

Nullification \Nul`li*fi*ca"tion\, n. [L. nullificatio contempt. See Nullify.] The act of nullifying; a rendering void and of no effect, or of no legal effect. [1913 Webster]
Right of nullification (U. S. Hist.), the right claimed in behalf of a State to nullify or make void, by its sovereign act or decree, an enactment of the general government which it deems unconstitutional. [1913 Webster]