fastness vs velocity

fastness

noun
  • The quality or state of moving quickly; quickness, rapidity, swiftness. 

  • The ability of a dye to withstand fading. 

  • A fortified or secure place; a fortress, a stronghold. 

  • Something used to fasten or tie; a fastener or fastening. 

  • The quality or state of being strongly attached; firmness, secureness, tenacity. 

  • The quality or state of having an extravagant lifestyle or immoral habits. 

velocity

noun
  • Rapidity of motion. 

  • A vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component. 

  • The number of times that an average unit of currency is spent during a specific period of time. 

  • The rate of occurrence. 

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