energy peculiar to life which acts upon material in the physical universe and animates it, mobilizes it and changes it; natural creative energy of a being which he has free to direct toward survivalgoals. The term comes from the Greek letter theta (_), which the Greeks used to represent thought or perhaps spirit. —PDC Volume 3 Approved Glossary, —PDC Volume 7 Approved Glossary, —State of ManCongress Approved Gls (14.5.92), —Perception of Truth Approved Glossary (9 June 92), —Games Congress Gls (Approved 13.8.92)