Here is a general quote:
Mindfulness - putting a label to your emotions without becoming attached to them. Noticing that you feel mad, sad, happy while not allowing the emotions to take control. Being nonjugmental of emotions, since emotions are just fleeting feelings.
How does this relate to what you are thinking about the term?
We also have a workshop that touchs upon this topic -
https://bpdfamily.com/message_board/index.php?topic=64749.0