I like what you said but there is an issue:

  "No constant something"
  "No constant definition"

  Those are constant somethings and definitions.

  This context _becomes_ the very single context with which all
  others are to be viewed from.

  That doesn't make it wrong or right - just an easy trap to fall
  into; that of saying, "all is relative", except for "all is
  relative", which is a fixed certainty.

  But outside of that, I like how you think.