English to English 
American English to British English dictionary, showing differences in spelling as well.
Domain: geocities.com GoEnglish.com Idiom Dictionary
GoEnglish.com Idiom Dictionary teaches the meaning of English idioms and phrases.
Domain: goenglish.com Historical Thesaurus of English
Contains the vocabulary of English from the earliest written records to the present, with known recorded dates of usage, taken from the Oxford English Dictionary.
Domain: www2.arts.gla.ac.uk Hutchinson Dictionary of English Useage
Hutchinson Dictionary of English Usage can explain the difference and guide your choice, so search the 1600 entries to find the precise word to convey your meaning.
Domain: tiscali.co.uk HyperDic
Based on the WordNet lexical database and thesaurus, covers a selection of the most frequent English words. Includes synonyms, antonyms, examples and pronunciation and more.
Domain: hyperdic.net Hyperdictionary.com
Displays definitions with each individual word in the definition hyperlinked to its definition.
Domain: hyperdictionary.com Information Please Dictionary
Infoplease's free online dictionary. Features almanacs, an encyclopedia, and an atlas.
Domain: infoplease.com Macmillan English Dictionary
Resource site for the new Macmillan English Dictionary.
Domain: macmillandictionary.com MacquarieNet
Australia's leading online encyclopedia, brought to you by the publishers of the Macquarie Dictionary.
Domain: macnet.mq.edu.au Merriam-Webster's OnLine Dictionary
Official site for the reference publisher. Includes online versions of the collegiate dictionary and thesaurus.
Domain: m-w.com Merriam-Webster's WordCentral.Com
Student dictionary and rhyming dictionary online at Merriam-Webster's website. Daily Buzzword by subscription.
Domain: wordcentral.com Mike's English/American Dictionary
Fun look at the differences between US English and UK English. Written by the Brit who lived in Tossa Lane Texas.
Domain: effingpot.com Notes on American English
Shows differences between American and British spelling of common words.
Domain: scit.wlv.ac.uk Patterweb 2002: EMEDD Search Utility
Early Modern English Dictionaries Database Search.
Domain: chass.utoronto.ca SmartDictionary.com
Supports both searching and browsing and encourages user contributions.
Domain: smartdictionary.com The Alternative Dictionaries
Includes a list of slang terms and phrases in various languages.
Domain: notam02.no The English - American Dictionary
A humo(u)rous resource for Americans learning British/Scottish English.
Domain: english2american.com The Newbury House Online Dictionary
Search over 40,000 entries to get clear concise definitions and when available related pictures.
Domain: nhd.heinle.com The Wordsmyth S.A.T. Dictionary
Based on a frequency analysis, includes the 2000 words appearing most frequently on S.A.T. tests.
Domain: lightlink.com The Wordsworth Compendium
Program containing over 516,000 English words and phrases to solve word puzzles. Useful for the search and manipulation of words in all aspects of logological activities.
Domain: dictionary-thesaurus.com
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