Online Dictionaries

Access a variety of online dictionaries, thesaurus and acronym directories

A Maths Dictionary for Kids is an online math dictionary for students which explains over 955 common mathematical terms and math words in simple language with definitions, detailed visual examples, and online practice links for some entries.

The world's largest and most comprehensive directory and search engine for acronyms, abbreviations and initialisms on the Internet.

Dictionary of acronyms and abbreviations. Contains over 750,000 definitions.

The online version is made up of four dictionaries: the Cambridge Dictionary of American English, the Cambridge Learner’s Dictionary, the Cambridge International Dictionary of Phrasal Verbs and the Cambridge International Dictionary of Idioms. It’s a big website that you might want to explore if you’re looking for one of the more serious online dictionaries.

Improve vocabulary through games. Available in English, German, French, Spanish and Italian

Featuring 20,000 topics and 2,500 images. This is the only high-tech reference in the world that really teaches the jargon, phrases and buzzwords of this industry.

It’s made up of a typical dictionary, a thesaurus, a Spanish to English translation and a medical dictionary. It’s features are relatively sparse but if you’re looking for online dictionaries with good pedigrees Merriam-Webster Online should be of interest to you.

The Technology Dictionary has over 14,000 technology and computer related terms. The Technology Dictionary consists of definitions of IT and computer terms including but not limited to programming languages, software, hardware, operating systems, networking, mathematics, telecommunications, electronics, and more.

The Free Dictionary is among the best online dictionaries.

A bank of words and easy navigation of word search

A modern dictionary for a modern world. Visuwords™ represents Language visually.

Outstanding dictionary and engaging vocabulary teaching tool.