: the union of elements (such as body, emotions, thoughts, and sensations) that constitute the individuality and identity of a person

the set of someone's characteristics, such as personality and ability, that are not physical and make that person different from other people:

Your sense of self refers to your perception of the collection of characteristics that define you. Personality traits, abilities, likes and dislikes, your belief system or moral code, and the things that motivate you — these all contribute to self-image or your unique identity as a person.

Every individual has a self, yet no two selves are the same. Some aspects of the self create a sense of commonality with others whereas other aspects of the self set it apart. The self usually provides a sense of consistency, a sense that there is some connection between who a person was yesterday and who they are today.

Our self-concept is the image we have of our bodies, capabilities, impressions, etc. (Bailey, 2003). It includes: The material self. Our body, possessions, and other things in our lives. The interpersonal self. The views others hold about us. The intrapersonal self. Our emotions, desires, needs, values, etc. (Epstein, 1973)