The Concept of Notional Domain: Summary: The article is about exploring notional domain. Since, two occurrences can either be discernable or incomparable. Notional domain structure an occurrences as “interior”, as both the occurrences share some similarity and there is no division in between. As, it may have an organized center. Then, there is an exterior, which does not have shared center. Linguistic complements can be made through either boundary or using exterior only. Domain can be divided on the bases f various properties. i.e. time, intersubjective relations, aspect operations and modal operations. Since recognizing an utterance actually means to construct a relationship among markers. It takes place at two level. At level one it is the utterance and at level 2 it is the operation. So, researcher has constructed an operation of location. Since, no term can be located on its own, it can be located in relation to a referring system, which is located ...