As a profession, what is User Experience?

I'm writing an article and I have hit this wall (I did before, but forgot about it). Basically, I need to explain what is User Experience as a profession or corpus of knowledge.

I don't mean the usual UX definitions, where UX is a "perception". I mean, how can we define UX work conceptually?

Some ideas I have are:

  • A discipline
  • A set of techniques or methodologies
  • A concept
  • A framework
  • A science
  • Something else, including a combination of any of the above

Personally, I tend to go along the line of "scientific multidisciplinary approach" which I consider an elegant way to say a lot and nothing at the same time, but what is it exactly?