An English dictionary is a book that contains a list of up to or more than 250000 English words with their meanings. Because all the words learners will find it easy to look up a word in a short period of time.The English dictionary will tell you what a word means and what part of speech it is (e.g. a noun, a verb or an adjective).Dictionaries are also available in electronic from such as electronic dictionaries, also known as talking dictionaries. A brand name of the talking dictionary that has been very popular in Thailand is "Talking-Dict" that belongs to Union Sense Technologies Limited. Nowadays, dictionaries can be accessed using the Internet. This type of dictionary is called "Online Dictionary". An online dictionary is gaining in online and look up information on a regular basis.