From Latin 'immūnis' (exempt) — literally 'the study of exemption,' kin to 'community' (sharing duties) and 'communicate.'
The branch of medicine and biology concerned with immunity.
Coined in the late 19th century from Latin immūnis (exempt, free from public service, untouched, not subject to charge) and the Greek suffix -logia (study of, discourse on). Latin immūnis is composed of in- (not) and mūnis (performing services, under obligation), which derives from mūnus (duty, service, gift, public function), from PIE *mey- (to change, to exchange, to move). The root *mey- is the ancestor of migrate (to move), mutual (from Latin mūtuus, exchanged), and community (from Latin commūnitas — those who share duties together, the communal bond as opposed
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