appeasement vs attenuation

appeasement

noun
  • The state of being appeased; the policy of giving in to demands in order to preserve the peace. 

attenuation

noun
  • A reduction in the level of some property with distance, especially the amplitude of a wave or the strength of a signal. 

  • The reduction of the active principles of medicines to minute doses. 

  • The tapering of a leaf etc to a fine point. 

  • A weakening in the virulence of a pathogen or other microorganism. 

  • A fabrication process in which a material is stretched out into a thin shape. 

  • The proportion of sugar that is converted to ethanol by a yeast. 

  • A gradual diminishing of strength. 

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