Co-optation is defined as the process of taking over or absorbing something, usually an organization or movement. Synonyms for co-optation include assimilation, incorporation, absorption, appropriation, annexation, integration, and adoption. These words all refer to the act of taking something and making it a part of something else. While the nuances of these words differ slightly, they all share the idea of bringing something into a larger whole. Co-optation can be used in a negative sense, where one group takes over another, or in a positive sense, where different groups come together for a common goal. Regardless of the context, the synonyms for co-optation help to expand our vocabulary and understanding of this important concept.