mean solar day is a noun meaning "time for Earth to make a complete rotation on its axis". It carries one recorded sense.
time for Earth to make a complete rotation on its axis
“two days later they left”
“they put on two performances every day”
“there are 30,000 passengers per day”
Definitions, synonyms and semantic relations for mean solar day come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.