What does falseality mean?

"Falseality" is not a standard English word. It's likely a misspelling of "falsity".

Falsity means:

* The state of being false or untrue.

* The quality of being incorrect or misleading.

For example:

* "The scientist proved the falsity of the theory."

* "The detective uncovered the falsity of the alibi."

If you are encountering "falseality" in a specific context, please provide more information so I can better understand what you're asking.