It is widely accepted that the oppositional concept pairs and their inner semantic relations are useful for deeper understanding the language as well as the basic principles of its speakers’ cognition. The aim of this study is to investigate the cognitive nature of oppositions in language through the semantic approach, in particular life and death concepts in Turkish. The two extended semantic fields for each concept were created. Having analyzed all the collected items and therefore deduced the hierarchy of the cognitive features of each concept separately, the two fields were imposed. It was found that the fields have the unique coincidence in a number of the same features (movement; a set of inseparable dialectical units; has an impact on the person; physiological process) implemented in different ways. This indicates that there is a possibility to investigate the estimated relations with the other concepts established on these features and suggests the opportunity to describe other oppositional units in the framework of any language with this methodology.Keywords: cognitive linguistics, oppositional concepts, semantic field, cognitive features, the Turkish language.