1o_ In medicine 'APP' is the acronym for "patient pathological history". See anamnesis . 2nd_ 'APP' has several developments in Spanish, such as "public-private partnership" or "potentially dangerous animal". 3rd_ 'APP' is the acronym for the Peruvian political party Alianza Para el Progreso . 4th_ 'app' is the acronym for applet and English/application ( "application, software to install on an operating system") .