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From The Collaborative International Dictionary of English v.0.48:
Ostentation \Os`ten*ta"tion\, n. [L. ostentatio: cf. F. ostentation.] 1. The act of ostentating or of making an ambitious display; unnecessary show; pretentious parade; -- usually in a detractive sense. "Much ostentation vain of fleshly arm." --Milton. [1913 Webster] He knew that good and bountiful minds were sometimes inclined to ostentation. --Atterbury. [1913 Webster] 2. A show or spectacle. [Obs.] --Shak. [1913 Webster] Syn: Parade; pageantry; show; pomp; pompousness; vaunting; boasting. See Parade. [1913 Webster]