iteration vs recursion

iteration

noun
  • A single repetition of the code within such a repetitive process. 

  • Recital or performance a second time; repetition. 

  • A variation or version. 

  • The use of repetition in a computer program, especially in the form of a loop. 

recursion

noun
  • The act of recurring. 

  • The act of defining an object (usually a function) in terms of that object itself. 

  • The invocation of a procedure from within itself. 

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