intellection vs mental grasp

intellection

noun
  • The mental content of an act of grasping by means of the intellect, as a thought, idea, or conception. 

  • The mental activity or process of grasping with the intellect; apprehension by the mind; understanding. 

  • A particular act of grasping by means of the intellect. 

mental grasp

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