adj. 1 a (often foll. by against, from, to) protected against an infection owing to the presence of specific antibodies, or through inoculation or inherited or acquired resistance. b relating to immunity (immune mechanism). 2 (foll. by from, to) free or exempt from or not subject to (some undesirable factor or circumstance). immune response the reaction of the body to the introduction into it of an antigen.
[ ME f. L immunis exempt from public service or charge (as IN-(1), munis ready for service): sense 1 f. F immun ]