Association that used to represent reinsurance companies as well as insurance companies that did not market marine insurance. LIRMA and the Institute of London Underwriters shared the same facility for processing policies and claims. The IUA was formed in January 1998 from the merger of the London International Insurance and Reinsurance Market Association (LIRMA) and the Institute of London Underwriters (ILU). See Also: “International London Underwriters Association of London.” Also, See Also: “Institute of London Underwriters.”