The Oxford dictionary, published by Oxford University Press, is considered the most comprehensive in the English language. It collects all known uses and forms of each word in all variants of the language.
Follow this link for the online version:
https://www.oxfordlearnersdictionaries.com/
Cambridge University Press has been publishing dictionaries for English learners since 1995. They include clear explanations on the grammar, with examples of how it is used in written and spoken English.
Follow this link for the online version:
https://dictionary.cambridge.org/es/diccionario/ingles/
Collins Dictionary was the first British English dictionary made from the information output by a computer database. Therefore, every aspect of an entry was handled by a different editor using different formulas or templates
Follow the link for the online version:
https://www.collinsdictionary.com/es/diccionario/ingles
Merriam–Webster Inc. is an American publisher that mainly publishes dictionaries. They also offer a thesaurus, a medical dictionary, a sports dictionary and a geographical dictionary.
Follow this link for the online version:
https://www.merriam-webster.com/
