* It might be a misspelling. Perhaps you meant a word like "gravity," "activity," or "levity."
* It could be a technical term. If you found "gevity" in a specific context, like a scientific paper or industry jargon, it might be a specialized term.
* It could be a made-up word. Some people create new words for fun or to describe specific concepts.
To get a better understanding, please provide more context. Where did you encounter this word? What was the surrounding text?
With more information, I might be able to help you determine the intended meaning.