Negation (noun)

1. The act of denying, rejecting, or disproving a statement or idea.
2. The act of denying the existence, presence, or validity of something.

Origin:

Derived from the latin word 'negatio' meaning 'denial' or 'rejection'.

Examples:

1. The negation of the theory was based on the findings of the experiment.
2. The negation of the claim was supported by the evidence presented in court.
3. The negation of the proposal was expressed in the resolution passed by the council.
4. The negation of the argument was demonstrated by the counter-example.
5. The negation of the hypothesis was revealed by the results of the study.