assertion

An assertion is an allegation or proclamation of something, often as the result of opinion as opposed to fact. (noun)

An example of someone making an assertion is a person who stands up boldly in a meeting with a point in opposition to the presenter, despite having valid evidence to support his statement.
An example of an assertion was that of ancient scientists that stated the world was flat.

See assertion in Webster's New World College Dictionary

See assertion in American Heritage Dictionary 4

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