INJECT meaning: 1. to use a needle and syringe (= small tube) to put a liquid such as a drug into a person's body…. Learn more. Injections are classified in multiple ways, including the type of tissue being injected into, the location in the body the injection is designed to produce effects, and the duration of the effects. Synonyms for INJECT: insert, introduce, add, interject, interpolate, fit (in or into), intersperse, insinuate; Antonyms of INJECT: eliminate, extract, exclude, withdraw, deduct, expel, subtract, eject Embark on your journey to enhanced beauty and wellness with Inject Tulsa. Reach out to us today and discover the personalized care and advanced treatments that will help you look and feel your best. Definition of inject verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. INJECT definition: 1. to use a needle and syringe (= small tube) to put a liquid such as a drug into a person's body…. Learn more. The meaning of INJECT is to introduce into something forcefully. How to use inject in a sentence. To inject is to give an injection, or a shot. When your doctor tells you that you need a flu shot, she wants to inject you with a vaccine that will help keep you from getting sick. You are most likely to hear the verb inject at the doctor's office. To inject is to give an injection, or a shot. When your doctor tells you that you need a flu shot, she wants to inject you with a vaccine that will help keep you from getting sick. You are most likely to hear the verb inject at the doctor's office. 1. to force (a fluid) into a passage, cavity, or tissue. 2. to introduce (something new or different): to inject humor into a situation. 3. to interject (a remark, suggestion, etc.), as into conversation.