stipulation vs uncertainty

stipulation

noun
  • Something that is stated or stipulated as a condition of an agreement. 

  • The situation, arrangement, and structure of the stipules. 

  • The act of stipulating; a contracting or bargaining; an agreement. 

  • A goal to be achieved in a chess problem; for example, to checkmate Black within a specified number of moves. 

uncertainty

noun
  • Something uncertain or ambiguous. 

  • Doubt; the condition of being uncertain or without conviction. 

  • A parameter that measures the dispersion of a range of measured values. 

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