All these dictionaries are extremely resourceful tools for classroom usage. After having analysed the following links, we have checked that they are all subscription-free and have the following features in common:
- Audio pronunciation
- Phonetic transcription
- Word definition
- Sentence examples
- Related words
- Word of the day
- Puzzles and games
- New words
- Links to encyclopedias
http://dl.dropbox.com/u/24105777/dictionarychecklist.docx