WordNet® is a large lexical database of English with up to 140,000 entries and more than 1.4 million words, developed by the Cognitive Science Laboratory at Princeton University.

A rich source of words for everyone who loves language, this free dictionary is both comprehensive and authoritative with its 123,000 words and 200,000 definitions based on the Collins Word Web - an unrivaled and constantly updated 2.5 billion-word database of today's English.

The leading and most trusted single-volume English dictionary is now available for FREE!

* The most comprehensive coverage of English everywhere it’s spoken
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Collins Mini Gem Finnish-Dutch & Dutch-Finnish Dictionary is an up-to-date, easy-reference dictionary, ideal for learners of Finnish and Dutch of all ages. The dictionary covers about 10,000 words from each language with Collins pre-recorded audio pronunciation for each word.

Webster's New World Dictionary and Thesaurus is a software bundle of the Webster’s New World College Dictionary and the Webster’s New World Roget’s Thesaurus making the perfect reference to use at school, at the office or at home.

Collins Mini Gem Norwegian-Dutch & Dutch-Norwegian Dictionary is an up-to-date, easy-reference dictionary, ideal for learners of Norwegian and Dutch of all ages. The dictionary covers about 10,000 words from each language with Collins pre-recorded audio pronunciation for each word.

Collins Mini Gem English-French & French-English Dictionary is an up-to-date, easy-reference dictionary, ideal for learners of French and English of all ages. The dictionary covers about 10,000 words from each language with Collins pre-recorded audio pronunciation for each word.

This best-selling dictionary covers all areas of philosophy and contains terms from the related fields of religion, science, and logic. Clear and authoritative definitions make it an essential resource for students and teachers and an ideal introduction for anyone with an interest in philosophy.

The fourth edition of this leading dictionary (previously A Dictionary of Earth Sciences) contains over 7,500 clear and concise entries on all aspects of geology and earth sciences, including planetary science, volcanology, palaeontology, and mineralogy.

The thesaurus that works hardest for you! Webster’s New World Roget’s A-Z Thesaurus opens up the world of words and leads you to a more precise and more effective communication.

With over 4,700 entries, including over 200 new terms for this edition, this is the ideal reference resource for students of chemistry at all levels, either at school or at university, undergraduate lecturers, and students and lecturers in related disciplines such as biology. Thanks to its greater breadth of content, this latest edition of the Dictionary of Chemistry also appeals to students in related disciplines such as medicine, forensics, and metallurgy.

The Dictionary of Dentistry provides over 4,000 definitions covering all the important terms and concepts used in dentistry today. Entries are written in clear and concise English without the use of unnecessary dental or medical jargon, and many entries are supplemented by detailed line drawings.

With over 10,000 clear and concise entries, written by medical and nursing specialists, this trusted dictionary covers the theory and practice of nursing, and even includes entry-level web links. The text is enhanced by 100 helpful illustrations and tables. This is an invaluable reference tool for all nursing students, recently qualified and practising nurses, and people training and working in related fields such as midwifery and health visiting.

This is the most popular dictionary of physics available. It contains over 3,800 entries covering all commonly encountered physics terms and concepts, as well as terms from the related fields of astronomy, astrophysics, and physical chemistry. With 200 new entries and expanded coverage in areas including applied physics, statistical distributions, polymers, and nanoscience, A Dictionary of Physics is more comprehensive than ever before.

‘This book is rich in peculiarities for the interested observer’ - The Independent

The second edition of the Oxford Dictionary of Astronomy contains over 4,300 up-to-date entries covering all aspects of astronomy. Compiled with the help of over 20 expert contributors under the editorship of renowned author and broadcaster Ian Ridpath, A Dictionary of Astronomy covers everything from space exploration and the equipment involved, to astrophysics, cosmology, and the concept of time.

An authoritative and comprehensive dictionary containing 2,500 key economic terms with clear, concise definitions. It covers all aspects of economics including economic theory, applied microeconomics and macroeconomics, labour economics, public economics and public finance, monetary economics, environmental economics, and many others.

The wide-ranging Oxford Dictionary of World History contains a wealth of information on all aspects of history, from prehistory right up to the present day. It includes biographies of key figures in world history, historical summaries for each country, and entries on religious and political movements, international organizations, and key battles and places.

Collins Mini Gem English-Greek & Greek-English Dictionary is an up-to-date, easy-reference dictionary, ideal for learners of Greek and English of all ages. The dictionary covers about 10,000 words from each language with Collins pre-recorded audio pronunciation for each word.

Oxford Dictionary of Literary Terms provides clear, concise, and often witty definitions of the most troublesome literary terms from abjection to zeugma. Now available in a new, fully updated and expanded edition, it offers readers increased coverage of new terms from modern critical and theoretical movements, such as feminism, and schools of American poetry, Spanish verse forms, life writing, and crime fiction.

This is the most wide-ranging and up-to-date dictionary of critical theory available, covering the whole range of critical theory, including the Frankfurt school, cultural materialism, gender studies, literary theory, hermeneutics, historical materialism, and sociopolitical critical theory. Entries clearly explain even the most complex of theoretical discourses, such as Marxism, psychoanalysis, structuralism, deconstruction, and postmodernism.