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A hierarchy (in Greek hieros, sacred, and arkho, rule) is a system of ranking and organizing things.

Hierarchy is a subset of context. Human knowledge is hierarchical, because higher-level abstractions depend on lower-level knowledge, all the way down to perceptual evidence. For example, in the simple case of the conceptual chain from the higher concept "furniture" to "coffee table":

Furniture [Abstract from Abstraction] -> Table [Concept] -> Coffee Table [Percept]

Epistemology Topics
Senses | Consciousness | Volition | Concepts: Unit, Concept-Formation
Objectivity | Knowledge: Context, Hierarchy | Reason: Certainty, Truth, the Arbitrary | Emotions