78 is a noun and adjective meaning "the cardinal number that is the sum of seventy and eight". It carries 3 recorded senses.
the cardinal number that is the sum of seventy and eight
a shellac based phonograph record that played at 78 revolutions per minute
being eight more than seventy
Definitions, synonyms and semantic relations for 78 come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.