Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
effectual is an adjective meaning "producing or capable of producing an intended result or having a striking effect". It carries 2 recorded senses.
producing or capable of producing an intended result or having a striking effect
“an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation”
“effective teaching methods”
“effective steps toward peace”
“made an effective entrance”
“his complaint proved to be effectual in bringing action”
“an efficacious law”
Definitions, synonyms and semantic relations for effectual come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.