<unk>  in its common usage means sexual desire; however, more technical definitions, such as those found in the work of Carl Jung, are more general, referring to<unk>  as the free creative—or psychic—energy an individual has to put toward personal development or individuation.
Sigmund Freud (the father of modern psychology) popularized the term and defined<unk>  as the instinct energy or force, contained in what Freud called the identification, largely the loss of the consciousness component of the psychology. Freud pointed out that these<unk> nal drives can conflict with the conventions of civilized behavior. It is this need to conform to society and control the<unk>  that leads to tension and disturbance in the individual, prompting the use of ego defenses to dissipate the psychic energy of these unmet and mostly unconscious needs into other forms.  Excessive use of ego defenses results in neurosis. A primary goal of psychological analysis is to bring the drives of the identitification into consciousness, allowing them to be met directly and thus reducing the patient's reliance on ego defenses.
Libido
Chilblain
Regret 
Bejel
Sultiame
Pennyroyal
Essiac
Wart