Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hereditarianism is a noun meaning "the philosophical doctrine that heredity is more important than environment in determining intellectual growth". It carries one recorded sense.
the philosophical doctrine that heredity is more important than environment in determining intellectual growth
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 hereditarianism come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.