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With regard to special lexicology the synchronic approach is
                            concerned  with  the  vocabulary  of  a  language  as  it  exists  at  a
                            certain time (e.g., a course  in Modern English  Lexicology). The
                            diachronic approach in terms of special lexicology deals with the
                            changes and the development of the vocabulary  in the course of
                            time. It is special historical lexicology that deals with the evolution
                            of vocabulary units as time goes by.
                                  Vocabulary  studies  include  such  aspects  of  research  as
                            etymology, semasiology and onomasiology.
                                  The evolution of a vocabulary forms the object of historical
                            lexicology  or  etymology  (from  Gr.  etymon  “true,  real”),
                            discussing  the  origin  of  various  words,  their  change  and
                            development, examining the  linguistic and extra-linguistic  forces
                            that modify their structure, meaning and usage.
                                  Semasiology  (from  Gr.  semasia  “signification”)  is  a
                            branch  of  linguistics  whose  subject-matter  is  the  study  of  word
                            meaning  and the classification of changes  in the signification of
                            words  or  forms,  viewed  as  normal  and  vital  factors  of  any
                            linguistic  development.  It  is  the  most  relevant  to  polysemy  and
                            homonymy.
                                  Onomasiology is the study of the principles and regularities
                            of  the  signification  of  things  /  notions  by  lexical  and  lexico-
                            phraseological means of a given language. It has its special value
                            in studying dialects, bearing an obvious relevance to synonymity.
                                  Praseology. It deals with phraseological units.
                                  Lexicography.  It  is  a  practical  science.  It  describes  the
                            vocabulary and each lexical unit in the form of dictionaries.
                                  Lexical  Morphology.  It  deals  with  the  morphological
                            stricture of the word.
                                  Word-formation. It deals with the patterns which are used
                            in coining new words.
















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