- The Longman English Dictionary Online
The online version of this dictionary is free (non-audio version) and is an up-to-date general dictionary. Definitions are clear and not too complex and each entry includes clear information about word class, word grammar, pronunciation and usage. Most entries also give example sentences.
- Web English Teacher: Homonyms, Homophones, Words with Multiple Meanings
Links to ten sites which contain lists of words with multiple meanings as well as explanations, exercises and activities that allow you test yourself.