Dissociation is the state in which, on some level or another, one becomes somewhat removed from reality, whether this be daydreaming, performing actions without being fully connected to their performance ("running on automatic"), or other, more disconnected actions. Feeling "out of it"; unable to remember what was said or done. It is the opposite of "association" and involves the lack of association, (in the case of borderline personality disorder, the lack of association with one's identity), with the rest of the world.