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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
efficaciously is an adverb meaning "in an effective manner". It carries one recorded sense.
in an effective manner
“these are real problems that can be dealt with most effectively by rational discussion”
Definitions, synonyms and semantic relations for efficaciously come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.