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3.3 The main problems in lexicography meaning.
The problems of lexicography are connected with the selection of headwords, the number, the structure and contents of the vocabulary entry (in different types of dictionaries). . This is especially important for certain lines of practical work in preparing graded elementary textbooks.The other problem which of the selected units have the right to a separate entry and which are to be included under one common head-word. These are, in other words, the issues of separateness and sameness of words. The first deals with syntagmalic boundaries of word-units and has to solve such questions as whether each other is a group of two separate words to be treated separately under the headwords each and other, or whether each other is a unit deserving a special entry (compare also: one another). As to the sameness, this deals with paradigmatic boundaries. How many entries are justified for hound? Concise Oxford Dictionary has two one tot the noun, and the other for the verb: to chase (as) with hounds'; the verb and the noun are thus treated as homonyms. Chambers's Twentieth Century Dictionary combines them under one head-word, i.e. it takes them as variants of the same word (hence the term "sameness"). The problem is even more complicated with variants belonging to the same part of speech. This involves differentiation between polysemy and homonymy. The second group of problems deals with the structure and content of a dictionary entry in different types of dictionaries. A historical dictionary (the Oxford Dictionary, for instance) is primarily concerned with the development of the English vocabulary.

CONCLUSION.
There are so many types of approaches and theories to learn lexicography and it's meaning. The processes of the development of any language, the changes that take a place in it are reflected in its dictionaries. Also certain achievements in the field of lexicography require attention to new theoretical problems of lexicography.
It is proved that a comprehensive system of dictionaries, the creation of classification solution to lecicographic problems, knowledge of language, lexical richness, more accurate expression of the typogical features of lexicography. By analyzing the various classification, generalizing the typology of dictionaries, a revision of the typology of existing dictionaries has been done, and a working definition of the concept of a dictionary system has been developed.
The study has demonstrated that the basic principle of the typological classification of English formal reference works is the way of specific terms description the relationship of the terms with the concept and the object of description, as well as the linguistic characteristics of the term as the element of the language for special purposes. The obtained results will help to develop more detailed classification of medical dictionaries with the further work out of a specialized dictionary structure taking into consideration a concept of description and dictionary user.
This course works play an important role of learning and getting information about lexicographic theories and lexical properties to know in English. I learned historical formation typological description and classifition of Lexicography. Also I try to research different useful practices and analyzing processes to learn lexicography. Lexicography depends on word and it's meaning, structure undoubtedly.