As nouns the difference between invalidity and nullification
is that invalidity is the state of being invalid; lack of validity while nullification is the act of nullifying; a rendering void and of no effect, or of no legal effect.
invalidity
English
Noun
The state of being invalid; lack of validity.
References
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nullification
English
Noun
(
en noun)
The act of nullifying; a rendering void and of no effect, or of no legal effect.
removal