Immemorial Usage Law and Legal Definition

Immemorial usage refers to a usage that existed for a long time. It extends beyond the reach of memory. Customs becomes law by immemorial usage.

In Kee v. Parks, 153 Tenn. 306 (Tenn. 1926), the court held that legislative power can be delegated in special instances sanctioned by immemorial usage originating anterior to the constitution and continuing unquestioned thereunder.