Objectification is the process by which abstract concepts are treated as if they were concrete things or physical objects. In this sense the term is synonym to reification.
Objectification also commonly refers to the regarding of a person as 'a thing'. For example, sexual objectification refers to the regarding of a person as merely a non-human object, or tool, for sex.
Philosopher Martha Nussbaum1 has argued that the objectification of something can be determined by the presence of the following factors:
Instrumentality - treating as a tool for one's own purposes;
Violability - treating as if permissible to smash;
and the denial of subjectivity - treating as if there is no need to show concern for the 'object's' feelings and experiences.
Suresh Emre 2 uses the the similar concept objectivation in the context of metaphysics. He defines subjectivation as the identity forming process and explains that when the potential/reality is mapped to a point forming the identity the potential/reality cannot be contained in the point and has to express itself as an orthogonal flow emerging from the identity center. He calls this flow objectivation.