Webster's English Dictionary

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ostentation

os.ten.ta.tion \.a:s-t*n-'ta--sh*n\ n [ME ostentacion, fr. MF ostentation, 
   fr. L ostentation-, o]stentatio, fr. ostentatus, pp. of ostentare to 
   display ostentatiously, fr. ostentus, pp. of ostendere 1: excessive display 
   : PRETENTIOUSNESS  archaic  2: an act of displaying : SHOW