English-English Dictionary

1.Dictionary.com
http://dictionary.reference.com/
2.MSNEncarta®
http://encarta.msn.com/encnet/features/dictionary/dictionaryhome.aspx
3.Cambridge Dictionary
http://dictionary.cambridge.org/
4.Merriam-Webster online
www.m-w.com
5.Heinle's Newbury House Dictionary of America English
http://nhd.heinle.com/Definition.aspx
6.譯典通知訊網
http://www.dreye.com/tw/
7.譯言堂 MyTrans
http://www.mytrans.com.tw/mytrans/trantrial/freesent.aspx
8.Yahoo!奇摩字典
http://tw.dictionary.yahoo.com/
9.電子字典
http://www.ee.tku.edu.tw/~rexchen/cdict/cdict.html
10.WorldLingo
http://www.worldlingo.com/zh_tw/microsoft/computer_translation.html