Definitions under social security rules clarify authorities, wage calculations, portal compliance, and key administrative terms for implementation. Defines key expressions for the Social Security (Central) Rules, 2026, including agency, appeal, appellate authority, assessing officer, authorised officer for employees' compensation, contribution period, benefit period, fund, form, schedule, section, specified, year, and related administrative terms used for implementation under the Code. The definitions also identify the Central Government, State Government, and designated officers as the relevant authorities for assessment, appeal, cess collection, employee registration, and portal-based compliance functions. It further prescribes calculation rules for average daily wages and standard benefit rate, and includes a saving clause for terms defined in the Code.