vacancy rate is a noun meaning "the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time". It carries one recorded sense.
the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time
Definitions, synonyms and semantic relations for vacancy rate come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.