(1):
(adv.) At which place; where.
(2):
(conj.) Considering that; it being the case that; since; - used to introduce a preamble which is the basis of declarations, affirmations, commands, requests, or like, that follow.
(3):
(conj.) When in fact; while on the contrary; the case being in truth that; although; - implying opposition to something that precedes; or implying recognition of facts, sometimes followed by a different statement, and sometimes by inferences or something consequent.