Definition of "Inject" :

verb: give an injection to

"We injected the glucose into the patient's vein."

verb: to introduce (a new aspect or element)

"He injected new life into the performance."

verb: to insert between other elements

verb: feed intravenously

verb: take by injection

"Inject heroin."

verb: force or drive (a fluid or gas) into by piercing

"Inject hydrogen into the balloon."