Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
counterfactual is an adjective meaning "going counter to the facts (usually as a hypothesis)". It carries one recorded sense.
going counter to the facts (usually as a hypothesis)
Definitions, synonyms and semantic relations for counterfactual come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.