descending vs precipitation

descending

noun
  • A descent. 

adj
  • Ordered such that each element is less than or equal to the previous element. 

  • Moving or sloping downwards. 

  • Becoming lower in pitch. 

  • Causing a sequence to follow a descending order. 

precipitation

noun
  • A hurried headlong fall. 

  • Any or all of the forms of water particles, whether liquid or solid, that fall from the upper atmosphere (e.g., rain, hail, snow or sleet). It is a major class of hydrometeor, but it is distinguished from cloud, fog, dew, rime, frost, etc., in that it must fall. It is distinguished from cloud and virga in that it must reach the ground. 

  • Unwise or rash rapidity; sudden haste. 

  • A reaction that leads to the formation of a heavier solid in a lighter liquid; the precipitate so formed at the bottom of the container. 

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