1. Introduction
The topic under discussion in this paper is about the lexical change and lexical variation. The change and vary of language never stops and it develops with the move of time and space (Zhichang, 2010, p.19 ). I will talk about the lexical change and variation in English lexis from three respects and I will discuss how the knowledge of lexical change and variation facilitates can be related to the learning and/or teaching of vocabulary.
2. Distinction between lexical change and variation
As explained by Zhichang (2010), lexical change is the process during which the vocabulary of a certain language changes over time and it is one type of language changes (p. 19). New words are always being created, while some words disappeared in the change of lexical. Many archaisms such as “trow”, “thou” and “hast” have become obsolete and they are replaced by new words. “Language variation refers to any distinguishable form of speech used by a speaker or group of speakers. (Wen-hua, 2008, p.49)” Lexical change is a diachronic change and lexical variation is more of a synchronic variation since it can be observed at any given time point. As Holmes(2001) said, language varies in three major ways which are interestingly interrelated—over time, in physical, and socially. Language change—variation over time—has its origins in spatial and social variation. (p. 205) Walt (n.d) claims that “One of the most fruitful areas for the application of language variation analysis is language change, given the fact that change necessarily involves variation.” Although all of the changes seem to contain variation, this doesn 't mean that all variations refer to the changes. This is also agreed by Johnson (1993), he points out that “Many terms that had undergone language change did not reveal patterned variation” (p. 256) Language change inevitably leads to variation, and variation within a speech community often leads to social
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