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usually uncountable, plural costlinesses
The characteristic of being costly. quotations examples
It was not large, but of unusual height, and fitted up with great costliness. The bookcases were ebony, inlaid with green morocco, and so were the tables, and the curtains were of crimson velvet.
1837, L[etitia] E[lizabeth] L[andon], “The Influence of the Dead”, in Ethel Churchill: Or, The Two Brides. […], volume II, London: Henry Colburn, […], page 270