This word was popularised by Sigmund Freud. He described it as an energy with which mental process and structures are invested. The Swiss psychiatrist Carl Gustav Jung described it as 'The energy that manifests itself in the life process and is perceived subjectively as striving and desire.' The factors affecting it are stated as:
Relational issues , Psychological factors, Physical factors, Lifestyle, Medications ,Testosterone and menstrual cycle.
It is the name of an afro-asiatic language spoken in Ethiopia. It is aslo the name of peruvian band. Which word?