Relating to or characterized by the process of coopting; tending to absorb or incorporate ideas or people into an existing system.
From cooption plus the suffix -ive (meaning 'tending to' or 'having the quality of'). The -ive suffix transforms the noun into an adjective describing something that has the quality of coopting.
Universities are often described as having 'cooptive' structures where student movements get absorbed into official committees, making dissent feel heard while actual power remains unchanged. It's a subtle but effective form of social control.
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