A denial, contradiction, or negative statement.(noun)
The opposite or absence of something regarded as actual, positive, or affirmative.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "negation" in a sentence
"Sorry, strictly speaking, the negation is applied to the verb and the verb to the subject."
"The negation of the negation is something like faith revealed as lies (which is why we revile hypocritical priests and pastors so very much)."
"The traditional objection to double negatives (in English only, given that double negation is common in other languages) is that they can be misinterpreted as positives (“It is not unimportant”)."