Answer the following questions. Your answers should be clear and short.What are the extra-linguistic factors that cause changes in meaning?
(1) HISTORICAL REASON. INCREASED SCIENTIFIC KNOWLEDGE AND DISCOVERY, OBJECTS, INSTITUTIONS, IDEAS, SCIENTIFIC CONCEPTS CHANGE IN THE COURSE OF TIME. (2)CLASS REASON. DIFFERENT CLAUSES HAVE DIFFERENT LANGUAGES AND ATTITUDES. (3)PSYCHOLOGICAL REASON. PEOPLE CHANGE WORD-MEANING OWING TO VARIOUS PSYCHOLOGICAL MOTIVES, 
