metaphysical vs notional

metaphysical

adj
  • Of or pertaining to metaphysics. 

  • Being an adherent of the philosophy of metaphysics. 

  • Immaterial, supersensual, not physical (more properly, "beyond" that which is physical). 

notional

adj
  • Of, containing, or being a notion; mental or imaginary. 

  • Having descriptive value as opposed to a syntactic category. 

  • Used to indicate an estimate or a reference amount 

  • Full of ideas or imaginings. 

  • Speculative, theoretical, not the result of research. 

noun
  • A fake company used as a front in espionage. 

How often have the words metaphysical and notional occurred in a corpus of books? (source: Google Ngram Viewer )