Source : Webster's Revised Unabridged Dictionary (1913)

Immune \Im*mune"\, n.
   One who is immune; esp., a person who is immune from a
   disease by reason of previous affection with the disease or
   inoculation.

Immune \Im*mune"\, a. [L. immunis. See {Immunity}.]
   Exempt; protected by inoculation. -- {Im*mu"nize}, v. t.

Source : WordNet®

immune
     adj 1: relating to the condition of immunity; "the immune system"
     2: secure against; "immune from taxation as long as he resided
        in Bermuda"; "immune from criminal prosecution"
     3: relating to or conferring immunity (to disease or infection)
        [syn: {resistant}]
     4: (usually followed by `to') not affected by a given
        influence; "immune to persuasion"

immune
     n : a person who is immune to a particular infection