What does 'within' mean in English?

Inside, indoors is a common meaning for 'within' in its use as an adverb. But it also may mean 'in the mind or conscience'. Not beyond the limits of, inside, in the scope of, in the course of are common meanings for 'within' in its use as a preposition. Either way, the English adverb/preposition derives from the Old English 'withinnan'.