The Collaborative International Dictionary
Negativing
Negative \Neg"a*tive\ (n[e^]g"[.a]*t[i^]v), v. t. [imp. & p. p. Negatived (n[e^]g"[.a]*t[i^]vd); p. pr. & vb. n. Negativing.]
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To prove unreal or untrue; to disprove.
The omission or infrequency of such recitals does not negative the existence of miracles.
--Paley. To reject by vote; to refuse to enact or sanction; as, the Senate negatived the bill.
To neutralize the force of; to counteract.
Wiktionary
negativing
vb. (present participle of negative English)