The act of sticking together or adhering jointly; when two or more things cling to each other at the same time.
From co- (together) + inhering (from Latin inhaerere: in- (in) + haerere (to stick)). The prefix co- was added in the 17th century to indicate mutual or joint action.
This word captures something physics does all the time—when two surfaces stick together not because they're glued, but because they naturally cling. It's the difference between a sticker and two wet hands that don't want to separate.
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