say it: kuhn-TAY-juhn
contagion is a noun meaning "any disease easily transmitted by contact". It carries 3 recorded senses.
any disease easily transmitted by contact
an incident in which an infectious disease is transmitted
the communication of an attitude or emotional state among a number of people
“a contagion of mirth”
“the infection of his enthusiasm for poetry”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for contagion come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.