Underwriter n. : One who underwrites his name to the conditions of an insurance policy, especially of a marine policy; an insurer.

Example:
What is it like to be an Underwriter for an insurance company?

Taxonomy
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Defination from the web:
Underwriting refers to the process that a large financial service provider (bank, insurer, investment house) uses to assess the eligibility of a ... When a dealer bank purchases Treasury securities in a quarterly Treasury bond auction, it acts as underwriter and distributor. ...