Obiter dictum meaning

An obiter dictum is a judge’s comment in a judgment that helps explain or explore the issues but is not necessary to the court’s decision. It may include illustrations, hypotheticals or broader observations. Latin for 'said in passing', the term is a descriptive common law label developed through case law rather than statute. Obiter dicta do not form binding precedent; only the ratio decidendi binds. Nonetheless they are frequently cited as persuasive authority. The persuasive weight turns on the level of court (with ‘strong obiter’ from the UK Supreme Court, Court of Appeal, or, in Ireland, the Supreme Court or Court of Appeal carrying significant influence), the judge’s expertise and the cogency of the reasoning. Usage is broadly consistent across England & Wales, Scotland and Northern Ireland; in Scotland the term ‘obiter’ is commonly used in the same sense. In Ireland, obiter from Irish appellate courts can shape future doctrine; UK authority is persuasive only. Practically, lawyers use obiter to: indicate likely future developments; test arguments where the ratio is against them; and interpret the scope of the binding ratio. Care is needed when classifying statements as ratio or obiter.