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63 Top Online Dictionaries in Various Languages and Types

63 Top Online Dictionaries in Various Languages and Types
Online dictionaries have become part and parcel of the writing and reading culture. Most people rely on online dictionaries to get a clear meaning of different words they come across when reading. Oxford’s English dictionaries are widely regarded as the world’s most authoritative sources on current English. This dictionary is regularly updated with evidence from one of the world’s largest lexical research programmes, and features over 350,000 words and phrases.

The best online dictionaries can be found all over the Internet, and they use a number of methods to develop something that can aid you in both reading and writing. Here are 63 top online dictionaries in various languages and types. Among them are advanced learning tools as well as multilingual options covering multiple niches and categories.

Online English Dictionaries

  1. American Heritage Dictionary
    American Heritage Dictionary of the English Language, Fifth Ed.
  2. Collins Dictionary
    Collins Unabridged English Dictionary; Collins Unabridged Thesaurus; Collins Webster’s American English Dictionary
  3. Unabridged, based on the Random House Webster’s Unabridged Dictionary.
  4. Merriam-Webster Online Dictionary
    Merriam-Webster Online Dictionary
  5. Oxford Dictionaries Online
    Oxford Dictionary of English; New Oxford American Dictionary; Oxford Thesaurus of English; Oxford American Writer’s Thesaurus

Advanced Learner’s Dictionaries

  1. Oxford Advanced Learner's Dictionary
    Oxford Advanced Learner’s Dictionary
  2. Cambridge Dictionary
    Cambridge Advanced Learner’s Dictionary
  3. Longman Dictionary of Contemporary English
    Longman Dictionary of Contemporary English
  4. Macmillan Dictionary
    Macmillan English Dictionary for Advanced Learners


  1. Linguee
    Free multilingual dictionary and contextual sentences. English, German, French, Spanish, Portuguese, Russian, Dutch, Italian, Venda and among other languages.
  2. LEO (website)
    Free multilingual collaborative dictionary for German
  3. Madura English-Sinhala Dictionary
    Free English to Sinhala and vice versa online dictionary.
  4. Multitran
    Multilingual online dictionary centered on Russian, and provides an opportunity of adding your own translation
  5. Ultralingua
    Free and premium multilingual dictionary
  6. Wiktionary
    Collaborative project run by the Wikimedia Foundation
  8. Reverso (language tools)
    Multilingual collaborative dictionary and contextual translations.

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  2. 87 of the Top Wikis on the Internet Today
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English Language

  1. Abbreviations
    World’s largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet.
  2. AcronymFinder
    Find out what any acronym, abbreviation, or initialism stands for.
  3. Computer Language
    Source of computer terms, concepts, important products and interesting stuff.
  4. Definitions
    Free and open multilingual dictionary that provides instant definitions from many respected reference resources such as the Random House College Dictionary, Princeton WordNet, Wiktionary, Webster Dictionary, U.S. National Library of Medicine, DOD Dictionary of Military and Associated Terms and many more.
  5. Free On-line Dictionary of Computing
    FOLDOC is a computing dictionary. It includes definitions of acronyms, jargon, programming languages, tools, architecture, operating systems, networking, theory, standards, mathematics, telecoms, electronics, institutions and companies, projects and history.
  6. Dictionary
    Search legal terms and definitions.
  7. Logos Dictionary
    Free online with additional premium content.
  8. Net Lingo
    Definitions for thousands of terms in the field of technology and communication.
  9. Online Etymology Dictionary
    This is a map of the wheel-ruts of modern English. Etymologies are not definitions; they’re explanations of what our words meant and how they sounded 600 or 2,000 years ago.
  10. OpenMD
    Aggregator of medical definitions for 10,000+ medical concepts with images and pronunciations.
  11. The Free Dictionary
    General and subject dictionaries for financial, legal, and medical terms.
  12. Thesaurus
    Find synonyms, antonyms, and brief definitions.
  13. Urban Dictionary
    A user-supplied “dictionary” of slang.
  14. Vocabulary
    Dictionary and engaging vocabulary teaching tool.
  15. Webopedia
    The online tech dictionary for students, educators and IT professionals.
  16. Wiktionary
    Multilingual dictionary and thesaurus written and edited by the public.
  17. Wolfram Mathworld
    The web’s most extensive mathematics resource.
  18. Wordflex
    Builds dynamic trees that are filled with synonyms, antonyms, syntactical associations.
  19. WordNet
    WordNet is a large lexical database of English. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept.
  20. Wordnik
    Wordnik is the world’s biggest online English dictionary, by number of words.
  21. Wordsmyth
    Dictionaries, word tools, and an amazing illustrated dictionary for children.
  22. WordSpy
    Site tracking new words and phrases in popular use.
  23. Wordweb
    Free and premium online English thesaurus and dictionary for Windows
  24. Your Dictionary
    Definitions, grammar tips, word game help and more from 16 authoritative sources.

Other Specific Languages

  1. Academic Dictionary of Lithuanian – Lithunian dictionary.
  2. Alankaa Dictionary of Arabic (page does not exist) – Arabic dictionary.
  3. Diccionario de la lengua española – Spanish dictionary.
  4. Dictionary of the Russian Language (Ozhegov) – Russian dictionary.
  5. Dictionary of the Scots Language – Scots dictionary.
  6. Dictionnaire de l'Académie française – French dictionary.
  7. Duden – German dictionary.
  8. Ekşi Sözlük – Turkish collaborative dictionary.
  9. E-mahashabdkosh – Bi-lingual and bi-directional Hindi / English dictionaries.
  10. Geiriadur Prifysgol Cymru – An online dictionary of the Welsh language.
  11. Plena Ilustrita Vortaro de Esperanto – Esperanto dictionary.
  12. Reta Vortaro – Esperanto dictionary.
  13. Svenska Akademiens ordbok – Swedish dictionary.
  14. Van Dale – Dictionary of the Dutch language.
  15. William Whitaker's Words – Latin dictionary.
  16. Woordenboek der Nederlandsche Taal – Dictionary of the Dutch language (free registration required).


  1. Crossword Dictionary
    Find answers to crossword puzzles, anagrams and cryptograms.
  2. Google Trends
    Explore and compare the popularity of words over time and geography based on Google search data.
  3. Internet Anagram Server
    Internet Anagram Server
  4. Rhyme Desk
    Find rhyming words.
  5. RhymeZone
    Find rhymes, synonyms, adjectives, and more.
  6. Write Rhymes
    Write Rhymes