The Collaborative International Dictionary
Descriptive \De*scrip"tive\, a. [L. descriptivus: cf. F. descriptif.] Tending to describe; having the quality of representing; containing description; as, a descriptive figure; a descriptive phrase; a descriptive narration; a story descriptive of the age.
Descriptive anatomy, that part of anatomy which treats of the forms and relations of parts, but not of their textures.
Descriptive geometry, that branch of geometry. which treats
of the graphic solution of problems involving three
dimensions, by means of projections upon auxiliary planes.
--Davies & Peck (Math. Dict. ) -- De*scrip"tive*ly, adv.
-- De*scrip"tive*ness, n.
Wiktionary
n. The characteristic of being descriptive.
Usage examples of "descriptiveness".
I liked the simple descriptiveness of their name for it: mesto-literally, place.