found: Reitz, J.M. ODLIS : online dictionary for library and information science, July 30, 2014(essay: A short literary composition written in expository prose addressed to the general reader, usually dealing thoughtfully and in some depth with a single theme, seen from the personal point of view of the essayist who does not necessarily attempt the systematic or comprehensive analysis one would expect in a dissertation or treatise. There are no limitations on style or content--essays can be formal or informal, descriptive, narrative, persuasive, humorous, satirical, historical, biographical, autobiographical, or critical.)
