A quaxiom (in my book) is a conjecture that, having hung around long enough, is promoted to the rank of hard fact and may even be fed back in as a foundation of the system of thought that first spawned it.
Thatcherism provided New Labour with many of its quaxioms, for example, "privatisation is best for the railways". Only a decade ago this was a radical and questionable assertion. Now it is the starting assumption for rail transport development - a meteoric rise.
Tyne and Wear