NCLAT rules define key terms governing appeals, authorised representatives, forms, and procedural references under company law. Rule 2 establishes the definitions governing the National Company Law Appellate Tribunal Rules, 2016: key terms include the Companies Act as the Act, advocate, Appeal under section 421(1), authorised representative under section 432, form in Annexure A, interlocutory application, party, Registrar, and section; undefined terms take meanings from the Companies Act or the NCLT Rules, 2016.