Indeed

Webster's Dictionary of the English Language

·adv In reality; in truth; in fact; verily; truly;

— used in a variety of sense. Esp.: (a) Denoting emphasis; as, indeed it is so. (b) Denoting concession or admission; as, indeed, you are right. (c) Denoting surprise; as, indeed, is it you? Its meaning is not intrinsic or fixed, but depends largely on the form of expression which it accompanies.