Since school, I was always familiar with the definition of: an opening or an introduction to something (e.g. a story).
Only yesterday, I found out that there's a totally different definition for it: "a clear and full explanation of an idea or theory."
What's peculiar here is that both definitions from two different dictionaries are totally different(?)
More specifically, in the context of reviewing a paper, what does it mean: "Clarity of Exposition?" Does it refer only to the introduction or the full explanation of an idea or theory? They probably mean clarity of presentation (of the full paper).