Legal Definition of Final: Definitive; terminating; completed. The term final is used in contrast to the word interlocutory | Looking for the legal definition of final? Learn how it signifies the conclusion of a legal matter, leaving no room for debate or reconsideration. Discover the importance of finality in the legal system and how it promotes efficiency, judicial economy, and certainty. Navigate the complexities of the legal landscape with a clear understanding of finality