theory-a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; theories can incorporate facts and laws and tested hypotheses; true in fact and theory.
wikiHow to Write Vendor Contracts. Some companies and organizations partner with vendors to provide a better product or service. Other businesses use vendors as contractors, providing something they need either on a one-time basis or an ongoing schedule. For example, many companies use vendors to supply technology, cleaning services, office equipment, or transportation. Anytime you use a vendor, you and the vendor should both sign a contract.
Vendor's Lien Law and Legal Definition. A vendor's lien is the right of a seller to repossess the property sold until the buyer makes all payments for the full purchase price. The property is the collateral given as security to the seller for the purchase price. It is sometimes used in connection with a purchase money mortgage on real estate.