[with object]To make a show of; to show off; to display ostentatiously or boastfully.
Origin
Mid 16th century; earliest use found in Resignation Northampton Priory. From classical Latin ostentāt-, past participial stem of ostentāre to show off, to display ostentatiously, to exhibit, display, frequentative form of ostendere. Compare Spanish ostentar, Catalan ostentar, Italian ostentare.