As authors tend to use different terms for the same entity or meaning, it may be the time for a uniformly use terminology in allergology and pneumology. The proposals reflect personal suggestions and are not authorized by any consensus conference, task force or specialized society. Presented are proposals for concepts- it was not intended to give definitions, which would open an even broader field of differing opinions. To avoid misunderstandings and to standardize scientific language, it seems sensible to agree on a single term - even if several alternatives are possible.