Market abuse definitions govern prevention and detection mechanisms, covering fraud, mule accounts and suspicious trading activity. Regulation 18E defines key terms for the institutional mechanism to prevent and detect fraud or market abuse, cross referencing existing statutory definitions for Designated Director, mule account, Key Managerial Personnel and Senior Management. It defines market abuse to include manipulative, fraudulent and unfair trade practices (including mule accounts) that may contravene specified SEBI regulations or Section 12A, defines fraud by reference to the Prohibition of Fraudulent and Unfair Trade Practices Regulations, and defines 'suspicious activity' to include fraudulent conduct relating to know your client requirements and suspicious order placing or trading activities. 'Employees' expressly includes KMP, senior management and Designated Directors.