Every language has a history, and, as in the rest of human culture, 
changes are constantly taking place in the course of the learned 
transmission of a language from one generation to another.Diversification of Languages
In the structural aspects of spoken language, their pronunciation and 
grammar, and in vocabulary less closely involved in rapid cultural 
movement, the processes of linguistic change are best observed by 
comparing written records of a language over extended periods.But, in some areas 
of vocabulary, particular words closely related to rapid cultural change 
are subject to equally rapid and therefore noticeable changes within a 
generation or even within a decade.