You know what it looks like… but what is it called?
TAKE THE QUIZ“non est”
The following 2 entries include the term non est.
non est factum
noun: a defense by way of denial of a deed (as the execution of a contract)
non est inventus
noun: the return of a sheriff on a writ or process when the defendant or person to be served or arrested is not found in the jurisdiction
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Merriam-Webster unabridged