Definitions clarifying change in control and associate shape regulatory duties of debenture trustees under SEBI rules. Regulation 2 defines core terms for the debenture trustee regime, including debenture trustee, debenture, trust deed, principal officer, networth, recognised stock exchange, and specifies that undefined expressions take meanings from the Act; it also defines associate and change in control with distinct constructions for listed and unlisted entities and treats 'issue' to include public offers and private placements seeking listing.