Correct spelling for the English word "IMMUN" is [ɪmˈʌn], [ɪmˈʌn], [ɪ_m_ˈʌ_n] (IPA phonetic alphabet).
Immun is not a recognized word in the English language. Therefore, a dictionary definition for "immun" does not exist. It is important to note that it is always recommended to consult reputable dictionaries and resources in order to obtain accurate information and definitions for words.