érvénnyel
érvénnyel is the instrumental form of the Hungarian noun érvény, which denotes validity, legal force, or effect. In official and legal texts, érvénnyel is used to express “by virtue of its validity” or “with its force,” referring to a document, rule, or law that is in effect.
Form and morphology: The base is érvény; the instrumental singular form is érvénnyel, and the plural instrumental
Usage: The term is mainly found in formal or legal writing. It signals the instrument or basis
Etymology and relation: Érvény is the root noun meaning validity or force, and érvénnyel is the instrumental