Oxford English Dictionary
The Encyclopedia Mythica is an online encyclopedia on mythology, folklore, and legends.
“To filthy mother fuckers everywhere.”
Longman Active Study Dictionary (LASD) 5th edition (En-En)
Macmillan Dictionary Online, April 2020
The HarperCollins Bible Dictionary
Revised and Updated 
Wordnik Full + Wordnik Examples
Lexico US Dictionary Powered by Oxford Living Dictionary
Lexico UK Dictionary Powered by Oxford Living Dictionary
Oxford Advanced Learner’s Dictionary, 9th Edition (OALD9)
An advanced learner’s dictionary is a monolingual learner’s dictionary, that is, a dictionary written for non-native speakers. It differs from a bilingual or translation dictionary, on the one hand, and a standard dictionary written for native speakers or linguistic scholars, on the other.
A learner’s dictionary is intended for non-native speakers who want information about the meaning and usage of words and phrases. Such dictionaries focus on current meanings, omitting outdated uses; etymology, a staple of standard dictionaries, is also usually omitted. All headwords are explained in uncomplicated language, typically using a core defining vocabulary of some 3,000 words, thus making the definitions more digestible to learners. There are many example phrases and sentences, but no quotations. Appendices and interspersed notes serve the targeted readership, providing additional guidance and help, for example with the usage of false friends, i.e. words that are often confused by learners.
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Oxford Primary English Dictionary, an Illustrated Dictionary for Starters (with sounds and pictures)
Oxford University Press.
The dictionary that helps students write and speak natural-sounding English, now in a new edition.
Which words usually go together? This dictionary shows you the common word combinations (collocations) that are essential for natural-sounding British and American English.
Completely revised and extended, the new edition has over 250,000 collocations and over 75,000 examples.
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Oxford Advanced Learner’s Dictionary, 9th edition online version
Merriam-Webster’s 11 Pronunciation Dictionary*
The idiom dictionary is compiled from the Cambridge International Dictionary of Idioms and the Cambridge Dictionary of American Idioms.