The prevalence of the phrase "lifestyle" in Persian conversations and writings encourages the thinkers to find a conceptual equivalent; success in this way depends on considering the emergence circumstances and functional preferences of this phrase in its original culture. Otherwise, it is not possible to find a conceptual equivalent in the Islamic Iranian culture due to the emergence distinct context, special concept, and particular function scope; thus, it does not bear the capacity of significance on our native concepts. Hence, transferring this phrase, as well as the similar concepts, into the Islamic culture causes eclecticism and loosing self-identity. This article is to prove this theory with the analysis of the concept of lifestyle. For this purpose, referring to the history of emerging lifestyle in two fields of psychology and sociology, I present different definitions of lifestyle in sociology; and after the analysis, I suggest a comprehensive definition for lifestyle. For the analysis, I used three factors including the parts of definition, concepts involved in definitions and the objective components of lifestyle.
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