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The main sources of the english dictionary are: 1.the american heritage dictionary augmented with 2.collins english dictionary (complete and unabridged), 3.random house kernerman webster's college dictionary, plus subject dictionaries. thesaurus: 1.wordnet 3.0; 2.collins 2002; 3.roget's 2014. translation: 1.harpercollins, 2.kernerman english multilingual dictionary.