ASME Y14.24 : Types and Applications of Engineering Drawings
A source from whom a purchased item is obtained.
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Alternate Definitions:

DAU - An individual, partnership, corporation, or other activity that sells property, goods, or services. A vendor may supply a government contractor. Vendors may be manufacturers, that is, actually produce the product or service they sell, or not. For example, a company that buys personal computers from a computer manufacturer under a contract name and then sells them to the government is a vendor (to the government) but not a manufacturer.