Definitions of inject:

• verb:   give an injection to

  Example: "We injected the glucose into the patient's vein"

• verb:   feed intravenously
• verb:   take by injection

  Example: "Inject heroin"

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

  Example: "Inject hydrogen into the balloon"

• verb:   to introduce (a new aspect or element)

  Example: "He injected new life into the performance"

• verb:   to insert between other elements