Etymology
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nullify (v.)

"render legally null and void, render invalid," 1590s, from Late Latin nullificare "to esteem lightly, despise," literally "to make nothing," from Latin nullus "not any" (see null) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Related: Nullified; nullifying; nullifier.

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Definitions of nullify

nullify (v.)
declare invalid;
Synonyms: invalidate / annul / quash / void / avoid
nullify (v.)
show to be invalid;
Synonyms: invalidate
nullify (v.)
make ineffective by counterbalancing the effect of;
From wordnet.princeton.edu