Demonstrator/ˈdemənstreɪtər/ Definition 1 of 3Pro Tip 1/3Live Demonstration Demonstrators often perform live to show a product's use. The demonstrator performed a live cooking show using the new blender. Pro Tip 2/3Possibly Salespeople Demonstrators might aim to persuade you to buy the showcased product. The demonstrator explained the vacuum's features to convince customers. Pro Tip 3/3Hands-On Experience Demonstrators allow you to try products after showing them. After his demonstration, the demonstrator let us test the new phone.