To detach or separate oneself from a connection or association with something or someone. She decided to disassociate herself from the controversial project.
To regard or treat as unconnected or unrelated. He tried to disassociate the two incidents in his mind.
To cause (a substance, idea, or group) to break apart into separate constituent elements; to undergo or bring about dissociation. Certain solvents can disassociate complex molecules into their ionic components.