Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
up-to-dateness is a noun meaning "the property of belonging to the present time". It carries one recorded sense.
the property of belonging to the present time
“the currency of a slang term”
Definitions, synonyms and semantic relations for up-to-dateness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.