1. any system or perspective emphasizing the development, changes, and interaction of mental and emotional processes, motivation, and drives.

2. the pattern of motivational forces, conscious or unconscious, that gives rise to a particular psychological event or state, such as an attitude, action, symptom, or mental disorder. These forces include drives, wishes, emotions, and defense mechanisms, as well as biological needs (e.g., hunger, sex). See also dynamic psychology. —psychodynamic adj.