Plain Meaning Rule

The plain meaning rule (sometimes called the literal rule) instructs that when a statute's words are clear and unambiguous on their face, courts must apply them as written, without resorting to legislative history, policy considerations, or extrinsic aids. The rule rests on the premise that the legislature's chosen text is the most reliable evidence of its intent and that judges should not substitute their own policy preferences for enacted law.

In U.S. federal practice, the doctrine is closely associated with textualism and is regularly invoked by the Supreme Court. Justice Antonin Scalia was its most prominent modern advocate, arguing in works such as A Matter of Interpretation (1997) that fidelity to text constrains judicial discretion and protects democratic legitimacy. The Court frequently states that statutory interpretation "begins with the language of the statute," and where that language is plain, "the sole function of the courts is to enforce it according to its terms" (a formulation traced to Caminetti v. United States, 1917).

Key features and limits:

• Ordinary meaning: Words are given the meaning a reasonable speaker would understand at the time of enactment, often supported by dictionaries and canons of construction.
• No absurdity: Most jurisdictions recognize an exception when literal application produces absurd or clearly unintended results.
• Ambiguity trigger: Only when text is genuinely ambiguous may courts consult legislative history, purpose, or agency interpretations (e.g., under Chevron deference, narrowed by Loper Bright Enterprises v. Raimondo, 2024).
• Contrast with purposivism: Purposivist judges, by contrast, look to the statute's broader objective even when text seems clear.

The rule also operates in treaty interpretation. Article 31 of the Vienna Convention on the Law of Treaties (1969) directs that treaties be interpreted "in good faith in accordance with the ordinary meaning to be given to the terms of the treaty in their context and in the light of its object and purpose," embedding a plain-meaning starting point in international law.