Definitions from Wiktionary (infect)

▸ verb:  (transitive) To 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.
▸ verb:  (transitive) To contaminate (an object or substance) with a pathogen.
▸ verb:  (transitive) To make somebody enthusiastic about one's own passion, or to communicate a feeling to others, or a feeling communicating itself to others.
▸ adjective:  (obsolete) Infected.
▸ adjective:  (rare, grammar, of a tense or verb form) Representing an action not yet completed.

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