lower chamber vs sitting

lower chamber

noun
  • The lower legislative chamber in a bicameral legislature; in many cases, the one that is directly elected and/or has more practical power, such as the power to raise and spend money. 

sitting

noun
  • A legislative session (in the sense of "meeting", not "period"). 

  • Uninterrupted application to anything for a time; the period during which one continues at anything. 

  • The incubation of eggs by a bird. 

  • A seance or other session with a medium or fortuneteller. 

  • A period during which one is seated for a specific purpose. 

  • A special seat allotted to a seat-holder, at church, etc. 

  • A clutch of eggs laid by a brooding bird. 

  • The part of the year in which judicial business is transacted. 

adj
  • Occupying a specific official or legal position; incumbent. 

  • Executed from a sitting position. 

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