Online Dictionaries

This page helps you find practical online dictionaries, including English-English definitions, antonyms (opposite words), synonyms (similar words), rhyming words and glossary lists. Some of these dictionaries also have audiospeaker icon.

English-English Dictionaries

Use English-English dictionaries when you have a word in English and you want to know the meaning in English.

Cambridge Dictionaries speaker icon
Choose in their drop-down box from several options such as British English, American English, Business English. With audio

Merriam-Webster speaker icon
American English. With audio

British English and American English. Looks in up to 40 different dictionaries speaker icon.

Wiktionary speaker icon
Also has many other languages.

Urban Dictionary
Dictionary of slang

EnglishClub Slang
With explanation, sample sentences and quiz

EnglishClub Phrasal Verbs
With explanation, sample sentences and quiz

Synonym Dictionaries (thesauruses)

Use synonym dictionaries to find words that mean the same or very nearly the same, for example: fast/quick/speedy/swift.

Select "Find synonyms" in the drop-down menu.

Antonym Dictionaries

Use antonym dictionaries to find words that mean the opposite, for example: fast/slow.

Select "Find antonyms" in the drop-down menu

Rhyming Dictionaries

Use rhyming dictionaries to find words that have endings that sound the same, for example: understand/motherland or rain/pain

Finds various types of rhymes.

Select "Find rhymes" in the drop-down menu.


Glossaries are alphabetical lists of words related to a particular topic and giving basic definitions.

Chat Abbreviations Glossary
Short forms used in chat rooms, texting etc and what they mean

Grammar Terms Glossary
List of words used to talk about grammar and their meanings

Pronunciation Terms Glossary
List of words used to talk about pronunciation and their meanings

TEFL Terms Glossary
For teachers, a glossary of terms used in teaching English and their definitions