Denial (noun)

1. The act of refusing to admit the truth or reality of something.
2. A statement or belief that something is not true.
3. The state of being in disbelief or rejecting a fact or reality.

Origin:

Late middle english: from old french deniaus, from latin negatio(n-), from negare 'to deny'.

Examples:

1. The government's denial of the allegations was met with skepticism.
2. His denial of any wrongdoing was not convincing.
3. The denial of the visa application was a major setback.
4. She was in a state of denial about the severity of her illness.
5. The denial of the request for assistance was a surprise to everyone involved.