A good dictionary is indispensable for those of us who want to use good English.

Correct spelling, word definition and its use as a part of speech; noun, verb, adjective etc are the core work of a dictionary.

Online dictionaries are now so much more than the traditional correct spelling plus definition. They are a combined thesaurus and a source for acronyms, idioms and an encyclopaedia.

The great thing is some of the best online dictionaries can be accessed for free.

Oxford

The most famous dictionary in the world is the Oxford Dictionary. And its amazing to think its 150 years of research is available for free online.

The Oxford Dictionary of English is the mobile version of the Oxford University Press' Oxford English Dictionary, widely accepted as one of the highest authorities in the study of English. Regarded as one of the flagship products in MobiSystems' large catalog of dictionaries the app features advanced search and language tools designed by a developer vastly experienced in the creation of dictionaries and learning tools.

Tailored to professionals, students, and academics, as well as anyone who needs a comprehensive and authoritative dictionary of current English at work or at home.

Designed to provide the most comprehensive search experience the dictionary combines several search tools to match or suggest what you are looking for, including:

• Search autocomplete helps you find words quickly by displaying predictions as you type

• Keyword lookup allows you to search within compound words and phrases

• Looking for a specific word but don't know how it's spelled? We've got you covered with our automatic ‘Fuzzy filter’ to correct word spelling, as well as ‘Wild card’ ('*' or '?') to replace a letter or entire parts of a word

• Camera search looks up words in the camera viewfinder and displays results in seconds

• Tap to Translate entries in other apps.

• Share word definitions via installed apps on your device

MacMillan Dictionary

In 2009, MacmillanDictionary.com was launched, including a thesaurus fully integrated into the entries. The dictionary is regularly updated and contains a crowd sourced component called the Open Dictionary which allows users to submit words too.

free dictionary online

MacmillanDictionary.com also offers unique treatment of metaphor, showing how many ordinary familiar words and phrases have metaphorical meanings, although we do not usually realise this when we use them.

The Free dictionary

Talk about an amazing free resource! TheFreeDictionary.com is an American online dictionary and encyclopedia that gathers information from a variety of sources.

TheFreeLibrary.com is a free reference website that offers full-text versions of classic literary works by hundreds of authors. It is also a news aggregator, offering articles from a large collection of periodicals containing over four million articles dating back to 1984. Newly published articles are added to the site daily. The site comprises a selection of articles from open-access journals that can in many cases also be found on a journal's own website.

online free dictionary

It is a sister site to TheFreeDictionary.com and usage examples in the form of "references in classic literature" taken from the site's collection are used on TheFreeDictionary.com's definition pages. In addition, double-clicking on a word in the site's collection of reference materials brings up the word's definition on TheFreeDictionary.com.

Dictionary Thesaurus, plus a specialist medical, legal, financial and a source for acronmyns, idioms and an encyclopedia.