MIDI is an acronym that stands for Musical Instrument Digital Interface. It is a set of standards designed in the mid 1980's to allow different musical instruments (usually keyboards) communicate with one another using digital messages.
The profit an insurance company generates after paying all claims. That is, the underwriting gain is what is left over after the premiums the company collects are added to its investment income and the amount the company pays for claims on its policies is subtracted. An underwriting gain is also called an underwriting profit.
BREAKING DOWN 'Underwriter'. Underwriters generally receive underwriting fees from their issuing clients, but they also usually earn profits when selling the underwritten shares to investors. However, underwriters assume the responsibility of distributing a securities issue to the public.