Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
rankness is a noun meaning "the property of producing abundantly and sustaining vigorous and luxuriant growth". It carries 2 recorded senses.
the property of producing abundantly and sustaining vigorous and luxuriant growth
“he praised the richness of the soil”
“weeds lovely in their rankness”
the attribute of having a strong offensive smell
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 rankness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.