Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
receptiveness is a noun meaning "willingness or readiness to receive (especially impressions or ideas)". It carries one recorded sense.
willingness or readiness to receive (especially impressions or ideas)
“he was testing the government's receptiveness to reform”
“this receptiveness is the key feature in oestral behavior, enabling natural mating to occur”
“their receptivity to the proposal”
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 receptiveness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.