conception vs notion

conception

noun
  • The power or faculty of apprehending of forming an idea in the mind; the power of recalling a past sensation or perception; the ability to form mental abstractions. 

  • An image, idea, or notion formed in the mind; a concept, plan or design. 

  • The act of conceiving. 

  • The fertilization of an ovum by a sperm to form a zygote. 

  • The state of being conceived; the beginning. 

  • The start of pregnancy. 

  • The formation of a conceptus or an implanted embryo. 

notion

noun
  • Mental apprehension of whatever may be known, thought, or imagined; idea, concept. 

  • A sentiment; an opinion. 

  • An invention; an ingenious device; a knickknack. 

  • Any small article used in sewing and haberdashery, either for attachment to garments or as a tool, such as a button, zipper, or thimble. 

  • Inclination; intention; disposition. 

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