Dance floor definition is an area where people can dance inside a restaurant club hall etc.
Dance floor all one word.
Look it up now.
That is for dancing.
But today all these words do have dictionary entries that define their musical usage.
An area of a nightclub restaurant etc.
So someday chances are good you ll find dancefloor as a valid alternate spelling for dance floor in all dictionaries along with other new words being invented today such as googled rickroll and photoshopped.
An area of a nightclub.