in fact; in reality; in truth; truly (used for emphasis, to confirm and amplify a previous statement, to indicate a concession or admission, or, interrogatively, to obtain confirmation): Indeed, it did rain as hard as predicted. Did you indeed finish the work?
(used as an expression of surprise, incredulity, irony, etc.): Indeed! I can scarcely believe it.
Origin: 1300–50;Middle English; orig. phrase in deed
early 14c., in dede "in fact, in truth," from O.E. dæd (see deed). Written as two words till c.1600. As an interjection, 1590s; as an expression of surprise or disgust, 1834. Emphatic form in yes (or no) indeedy attested from 1856, Amer.Eng.