The definition of Nor is nor |nôr|conjunction & adverb1 used before the second or further of two or more alternatives (the first being introduced by a negative such as "neither" or "not") to...
levels of responsibility and power; as you go up the hierarchy, you have more responsibility and power. hierarchy is the chain of officials from bottom to top. e.g you are working in an organization...
The opposite term is 'ventral' - For example in fish (and dolphins given the category) the dorsal fins are on the top of the body, while the ventral fins are on the underside.