Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
distinctness is a noun meaning "the quality of being sharp and clear". It carries 3 recorded senses.
the quality of being sharp and clear
the state of being several and distinct
the quality of being not alike; being distinct or different from that otherwise experienced or known
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for distinctness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.