Etymology
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infection (n.)

late 14c., "infectious disease; contaminated condition;" from Old French infeccion "contamination, poisoning" (13c.) and directly from Late Latin infectionem (nominative infectio) "infection, contagion," noun of action from past participle stem of Latin inficere "to spoil, to stain" (see infect). Meaning "communication of disease by agency of air or water" (distinguished from contagion, which is body-to-body communication), is from 1540s.

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Definitions of infection

infection (n.)
the pathological state resulting from the invasion of the body by pathogenic microorganisms;
infection (n.)
(phonetics) the alteration of a speech sound under the influence of a neighboring sound;
infection (n.)
(medicine) the invasion of the body by pathogenic microorganisms and their multiplication which can lead to tissue damage and disease;
infection (n.)
an incident in which an infectious disease is transmitted;
Synonyms: contagion / transmission
infection (n.)
the communication of an attitude or emotional state among a number of people;
the infection of his enthusiasm for poetry
Synonyms: contagion
infection (n.)
moral corruption or contamination;
ambitious men are led astray by an infection that is almost unavoidable
infection (n.)
(international law) illegality that taints or contaminates a ship or cargo rendering it liable to seizure;
From wordnet.princeton.edu