Costliness means preciousness or an abundance of costly possessions. Revelation uses the word in describing the wealth and luxury associated with fallen Babylon.
Definition
Costliness means preciousness or an abundance of costly things. It describes the possession or display of valuable goods and wealth.
Biblical Usage
The word occurs in the description of fallen Babylon, whose wealth made others rich by reason of her costliness.
Historical Bible Dictionaries
International Standard Bible Encyclopedia (ISBE)
<p>kost'-li-nes (timiotes, "preciousness," "an abundance of costly things"): Found only in Re 18:19, "made rich by reason of her costliness."</p>