Stimulant/ˈstɪmjələnt/ Definition 1 of 3Pro Tip 1/3Energy Boost Stimulants are often used to describe things that increase your energy quickly. Many students drink energy drinks as a stimulant during exams. Pro Tip 2/3Overuse Caution It's important to use 'stimulant' carefully, as overuse can imply addiction or dependence. He relies on a stimulant to get through his day. Pro Tip 3/3Natural vs Synthetic Stimulants can be natural like coffee, or synthetic like certain medications. She prefers a natural stimulant to synthetic ones.