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From The Collaborative International Dictionary of English v.0.48:
Nullity \Nul"li*ty\ (n[u^]l"l[i^]*t[y^]), n.; pl. Nullities. [LL. nullitias, fr. L. nullus none: cf. F. nullit['e] . See Null.] [1913 Webster] 1. The quality or state of being null; nothingness; want of efficacy or force. [1913 Webster] 2. (Law) Nonexistence; as, a decree of nullity of marriage is a decree that no legal marriage exists. [1913 Webster] 3. That which is null. [1913 Webster] Was it not absurd to say that the convention was supreme in the state, and yet a nullity? --Macaulay. [1913 Webster]