Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ground-floor is an adjective meaning "on the floor closest to level with the ground". It carries one recorded sense.
on the floor closest to level with the ground
“the ground-floor entrance is kept locked”
Definitions, synonyms and semantic relations for ground-floor come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.