According to wiktionary, 'scientism' has these meanings:
1. The belief that the scientific method and the assumptions and research methods of the physical sciences are applicable to all other disciplines (such as the humanities and social sciences), or that those other disciplines are not as valuable.
2. The belief that all truth is exclusively discovered through science.
Maybe the second definition kind of fits if you stretch it. I think 'futurism', not in the sense of the artistic movement, is a closer fit; '2. The study and prediction of possible futures.'
I think scientism runs deeper than just a set of philosophical beliefs. It is more like a modern religion, or even an aesthetic.
A key feature of scientism is that science itself is never well defined or understood by its adherents, so science is a floating signifier that can mean whatever its proponents want it to mean. Typically, these are not people with firsthand experience doing science, but consumers of second and thirdhand science media and science culture (TED Talks, "I fucking love science", NASA t-shirt, "I believe in science" bumper sticker, etc.). Lack of scientific literacy results in science taking on a ritual status, where following the ritual (scientific method, peer review, etc.) produces truth, and failure to find truth is always the fault of the mislead individual scientist. Because science is the ultimate source of truth, it is also the organizing principle for society, and those "anti-science" people who would question science are dangerous and stand in the way of progress--basically a religion.
> I think scientism runs deeper than just a set of philosophical beliefs. It is more like a modern religion, or even an aesthetic.
I agree.
> A key feature of scientism is that science itself is never well defined or understood by its adherents, so science is a floating signifier that can mean whatever its proponents want it to mean. Typically, these are not people with firsthand experience doing science, but consumers of second and thirdhand science media and science culture...
I don't think that completely true. I think you have different levels of adherents of scientism, and what you say is definitely true of most of the lower levels ("consumers of second and thirdhand science media and science culture").
However the top tier consists of the creators of a decent chunk of that "science media and science culture." Many of those people are actual scientists, but ones who have sought out the public eye as "science popularizers" and are best known for their works for general audiences.
Believe it or not, I have had more than one person tell me with sincerity that observing the contents of a box is "doing science", I imagine because they believe that science is actually the only way to acquire knowledge.
Meanwhile, these people mock the religious [in their imagination] for "being" insular/fundamentalist.
I find personally that "scientism", unlike many other ism-s, is an external label. I.e. I don't think people call themselves that. It's a negative label ascribed to people one philosophically disagrees with. As such, I am skeptical of its value and use.
1. The belief that the scientific method and the assumptions and research methods of the physical sciences are applicable to all other disciplines (such as the humanities and social sciences), or that those other disciplines are not as valuable.
2. The belief that all truth is exclusively discovered through science.
Maybe the second definition kind of fits if you stretch it. I think 'futurism', not in the sense of the artistic movement, is a closer fit; '2. The study and prediction of possible futures.'