Municipal debt securities definitions set issuer scope, public issue vs private placement, and required transactional accounts. Definitions prescribe key terms for issuance and listing: issuer (municipalities, statutory bodies, SPVs and certain pooled finance entities), municipal debt securities (non-convertible debt instruments), forms of offering (public issue, private placement, placement memorandum, shelf offer document), and operational constructs including designated stock exchange, credit enhancement, interest payment account, sinking fund account, and conduct-related categories like wilful defaulter and fugitive economic offender.