Online English Dictionaries | Онлайн словари английского языка

Cambridge dictionary | https://dictionary.cambridge.org/

Longman dictionary | https://www.ldoceonline.com/

Dictionary by Merriam-Webster | https://www.merriam-webster.com/

Oxford learner's dictionaries | https://www.oxfordlearnersdictionaries.com/

Linguee | https://www.linguee.com/

Macmillan dictionary | https://www.macmillandictionary.com/

WordReference | http://www.wordreference.com/

The free dictionary by Farlex | http://www.thefreedictionary.com/

ReversoContext | http://context.reverso.net/translation/

Word learner | https://word-learner.com/

Collins dictionary | https://www.collinsdictionary.com/

Thesaurus | https://www.thesaurus.com/

Ozdic | http://ozdic.com/

Dictindustry (technical dictionary) | http://en.dictindustry.com/

Technical English dictionaries and glossaries | http://www.susana-translations.de/dicenglish.htm

PONS | https://ru.pons.com