In phenomenology, the terms the Other identify the other human being, in his and her differences from the Self, as being a cumulative, constituting factor in the self-image of a person; as his or her acknowledgement of being real; hence, the Other is dissimilar to and the opposite of the Self, of Us, and of the Same.

The condition and quality of Otherness, the characteristics of the Other, is the state of being different from and alien to the social identity of a person and to the identity of the Self.

The term Othering describes the reductive action of labelling a person as someone who belongs to a subordinate social category defined as the Other. The practice of Othering is the exclusion of persons who do not fit the norm of the social group, which is a version of the Self.

Likewise, in the field of human geography, the action term to Other identifies and excludes a person from the social group, placing him or her at the margins of society, where the social norms do not apply to and for the person labelled as the Other.