centripetal vs outward

centripetal

adj
  • Directed towards the central nervous system; afferent. 

  • Directed or moving towards a centre. 

  • Of, relating to, or operated by centripetal force. 

outward

adj
  • visible, noticeable 

  • outer; located towards the outside 

  • Tending to the exterior or outside. 

adv
  • Towards the outside; away from the centre. 

noun
  • A ward in a detached building connected with a hospital. 

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