Source : Webster's Revised Unabridged Dictionary (1913)

Really \Re"al*ly`\, adv.
   Royally. [Obs.] --Chaucer.

Really \Re"al*ly\, adv.
   In a real manner; with or in reality; actually; in truth.

         Whose anger is really but a short fit of madness.
                                                  --Swift.

   Note: Really is often used familiarly as a slight
         corroboration of an opinion or a declaration.

               Why, really, sixty-five is somewhat old. --Young.

Source : WordNet®

really
     adv 1: in accordance with truth or fact or reality; "she was now
            truly American"; "a genuinely open society"; "they
            don't really listen to us" [syn: {truly}, {genuinely}]
     2: in actual fact; "to be nominally but not actually
        independent"; "no one actually saw the shark"; "large
        meteorites actually come from the asteroid belt" [syn: {actually}]
     3: in fact (used as intensifiers or sentence modifiers); "in
        truth, moral decay hastened the decline of the Roman
        Empire"; "really, you shouldn't have done it"; "a truly
        awful book" [syn: {in truth}, {truly}]
     4: used as intensifiers; `real' is sometimes used informally
        for `really'; `rattling' is informal; "she was very
        gifted"; "he played very well"; "a really enjoyable
        evening"; "I'm real sorry about it"; "a rattling good
        yarn" [syn: {very}, {real}, {rattling}]