nullity

n [U] lack of legal force; lack of validity 无法律约束力; 无效: the nullity of a marriage 婚姻无效 * [attrib 作定语] a nullity suit, ie legal action that asks for a marriage to be declared null and void 要求宣判婚姻无效的诉讼.

nuclear family, nuclear war, nuclear winter, nuclear-free, nucleate, nucleic acid, nucleolus, nucleus, nude, nudge, nudism, nudist, nudist camp (also nudist colony), nudity, nugatory, nugget, nuisance, null, nullification, nullify, numb, number, number one, numberless, numbly, numbness, numeracy, numeral, numerate, numeration, numerator, numerical, numerically, numerous, numinous, numismatics, numismatist, numskull (also numbskull), nun, nuncio,