1.VerbTo bring (the body or part of it) into contact with a substance that causes illness (a pathogen), so that the pathogen begins to act on the body; (of a pathogen) to come into contact with (a body or body part) and begin to act on it.
"Not everyone will be infected when an epidemic strikes."
2.VerbTo contaminate (an object or substance) with a pathogen.
3.VerbTo make somebody enthusiastic about one's own passion, or to communicate a feeling to others, or a feeling communicating itself to others.
"Her passion for dancing has infected me."
4.AdjectiveInfected.
5.AdjectiveRepresenting an action not yet completed.