Possible Clues:

• Based on hypothesis or theory rather than experiment (Latin)
• April Fools' Day or beginning of idiocy from first principles
• Not based on experience
• Like knowledge that's not based on previous experience
• Latin phrase meaning 'from cause to effect'
• How something may be assumed
• Earlier computer technology keeps using theory
• Based on deduction rather than experience
• Based on deduction, not observation
• I must support a religious leader without need of evidence