It is the ability to perform a job. The term is extended to the food needed to perform the work, including food that produces chemical energy to an organism, or electricity that directly moves a machine. Also figuratively is the vitality and willpower for a task. It is a word that comes to us from late Latin, but its etymology is Greek as 949; 957; ( in "inside" ) 949; 961; 947; 959; 957; ( ergon "work") .
