An archaic or rare term for immunity or exemption, particularly in medical or legal contexts.
From Latin immunis meaning 'exempt' or 'free from obligation', with the prefix in- (not) plus munis (service/duty). The 'a' prefix in amunam reflects a variant Latin form. The term fell out of common use as modern immunity terminology developed.
This forgotten word reminds us that the concept of 'immunity' originally meant being excused from civic duties in Rome—immunity from service, not disease—showing how scientific terminology completely repurposed ancient legal concepts.
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