Abstract: It can be stated that "thirasaara" (;sridr nj) is one of the most popular words in the so-called developed and standardized world that is considered to be developed. This article questions the extent to which the concept of "thiraasara" (in English sustainability) is defined reasonably, while this study focuses on the main purpose and two additional objectives. The main purpose is to present a more reasonable definition for "thirasaara" (sustainability).