Definition of "ostentation"

Sir Henry had consumed his substance in ostentation and riotous hospitality—had fed many at his board, made many merry in his halls, but not a friend was in his house of mourning; the very retainers who had grown rich upon his ruin, seemed to deem the burial of their master but a signal for carousing and license.

1837, L[etitia] E[lizabeth] L[andon], Ethel Churchill: Or, The Two Brides. […], volume I, London: Henry Colburn, […], pages 24–25

Let her awhile be secretly kept in,And publish it that she is dead indeed:Maintain a mourning ostentation;

1598–1599 (first performance), William Shakespeare, “Much Adoe about Nothing”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene i]