apheresis vs deduction

apheresis

noun
  • The removal of blood from a patient, and the removal of certain components (such as platelets) from that blood, followed by the transfusion of the filtered blood back to the donor (patient). 

  • Elision, suppression, or complete loss of a letter or sound (syllable) from the beginning of a word, such as the development of special from especial; procope. 

deduction

noun
  • That which is deducted; that which is subtracted or removed 

  • A conclusion; that which is deduced, concluded or figured out 

  • A process of reasoning that moves from the general to the specific, in which a conclusion follows necessarily from the premises presented, so that the conclusion cannot be false if the premises are true. 

  • The ability or skill to deduce or figure out; the power of reason 

  • A sum that can be removed from tax calculations; something that is written off 

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