In fairness, the question of what knowledge is is a rather subtle one: the Justified True Belief framework has certain problems. I'm personally inclined to dismiss that whole tangle of epistemological debate as hopelessly confused and just treat the word as referring to concept-clusters associated with strong evidence (and you seem to be doing something similar, if your second paragraph is anything to go by). That being said, though, all the standard senses of the word I'm aware of do seem to approach the idea of a reliable mapping between concepts and predictable reality from some angle.