Thetan Definition
    noun
  
 (Scientology) A soul or spirit or being.
Wiktionary 
Other Word Forms of Thetan
Noun
Singular:
 thetanPlural:
 thetansOrigin of Thetan
- From Ancient Greek θῆτα (thēta, “theta”), which is used in Scientology to represent the source of life. - From Wiktionary 
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