http://www.oxfordlearnersdictionaries.com/
(옥스포드사전)
http://dictionary.cambridge.org/dictionary/english/
(케임브리지대학사전)
http://beta.merriam-webster.com/
(미리엄-웹스터 베타사전)
http://www.learnersdictionary.com/
(미리엄-웹스터 어린이사전)
http://www.ldoceonline.com/dictionary/
(롱맨사전)
(원룩사전)
http://dictionary.reference.com/
(딕셔너리참고사전)