fitting vs vacuum tube

fitting

noun
  • A small part, especially a standardized or detachable part of a device or machine. 

  • The process of fitting up; especially of applying craft methods such as skilled filing to the making and assembling of machines or other products. 

  • A tube connector; a standardized connecting part of a piping system to attach sections of pipe together, such as a coupling 

  • The act of trying on clothes to inspect or adjust the fit. 

  • The action or condition of having fits in the sense of seizures or convulsions. 

  • A removable item in a house or other building, which can be taken with one when one moves out, such as a moveable piece of furniture, a carpet, picture, etc.; US furnishing; compare fixture. 

verb
  • Getting ready; preparing. 

adj
  • Ready, appropriate, suitable, or in keeping 

vacuum tube

noun
  • A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used. 

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