the GNU version of the Collaborative International Dictionary of English
n. The quality of being costy; expensiveness; sumptuousness.
The Century Dictionary and Cyclopedia
n. The character or fact of being costly; expensiveness; richness; great cost or expense; sumptuousness.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the quality possessed by something with a great price or value
Word Usage
"Unsatisfied with off-the-rack roman shades — too dinky and un-luxe — and horrified by custom curtain costliness, I noticed the industrial roller shade, an undervalued player on the scene."