instrumentalism
noun
in·stru·men·tal·ism ˌin(t)-strə-ˈmen-tᵊl-ˌi-zəm 
: a doctrine that ideas are instruments of action and that their usefulness determines their truth
Example Sentences
Recent Examples on the Web Doubtless not a few of them harbor a special disdain for American Evangelicalism, with its gaudy, prosperous instrumentalism. 
James Wood, The New Yorker, 2 Nov. 2020
James Wood, The New Yorker, 2 Nov. 2020 Word History
First Known Use
1904, in the meaning defined above