{"id": "efficacy", "metadata": {"operation": "retrieve", "provider": "Oxford University Press", "schema": "RetrieveEntry"}, "results": [{"id": "efficacy", "language": "en-gb", "lexicalEntries": [{"entries": [{"etymologies": ["early 16th century: from Latin efficacia, from efficax, efficac- (see efficacious)"], "grammaticalFeatures": [{"id": "mass", "text": "Mass", "type": "Countability"}], "pronunciations": [{"audioFile": "https://audio.oxforddictionaries.com/en/mp3/efficacy_gb_1.mp3", "dialects": ["British English"], "phoneticNotation": "IPA", "phoneticSpelling": "\u02c8\u025bf\u026ak\u0259si"}], "senses": [{"definitions": ["the ability to produce a desired or intended result"], "examples": [{"text": "there is little information on the efficacy of this treatment"}], "id": "m_en_gbus0313250.005", "registers": [{"id": "formal", "text": "Formal"}], "semanticClasses": [{"id": "ability", "text": "Ability"}], "shortDefinitions": ["ability to produce desired or intended result"], "synonyms": [{"language": "en", "text": "success"}, {"language": "en", "text": "successfulness"}, {"language": "en", "text": "efficacy"}, {"language": "en", "text": "productiveness"}, {"language": "en", "text": "fruitfulness"}, {"language": "en", "text": "potency"}, {"language": "en", "text": "power"}], "thesaurusLinks": [{"entry_id": "effectiveness", "sense_id": "t_en_gb0004640.001"}]}]}], "language": "en-gb", "lexicalCategory": {"id": "noun", "text": "Noun"}, "text": "efficacy"}], "type": "headword", "word": "efficacy"}], "word": "efficacy"}