Expressio Unius Est Exclusio Alterius Law and Legal Definition

Expressio unius est exclusio alterius is a Latin phrase that means express mention of one thing excludes all others. This is one of the rules used in interpretation of statutes. The phrase indicates that items not on the list are assumed not to be covered by the statute. When something is mentioned expressly in a statute it leads to the presumption that the things not mentioned are excluded. This is an aid to construction of statutes.