A critical approach to the meainng ana charecteristics of /etler which is type of word. This study has dealt with definition and characteristic of letters in Arabic language; however in this article has been analyzed their definition and characteristic. Before all else the senses of letter word in Arabic dictionaries is given in order to be understood the subject pretty good. Separately definitions which are famous in Arabic gramer is mentioned. At the same time the explanation and criticism

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... ut contents of this definitions together our opinion is given. According to us the best definition have been expressed. Besides we touched on the characteristic ofnames and verbs to be under stood the definition of the letters. The second part of this article is connected with characteristic of letters. Particularly knowledge on spiritual and utterance propertry of letters is given.