Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
seventy-eight 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
Definitions, synonyms and semantic relations for seventy-eight come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.