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Definition

Immune plants cannot be infected by a given pathogen.

Etymology. 1382, "exempt from service or obligation," from L. immunitatem (nom. immunitas) "exemption from performing public service or charge," from immunis "exempt, free," from in- "not" + munis "performing services" (cf. municipal), from PIE *moi-n-es-, suffixed form of base *mei- "to change" (see mutable). Medical sense "protection from disease" is 1879 from Fr. or Ger.