keystone

lakikivi

olennaisin elementti, tärkein tekijä puhekieltä The top stone of an arch.
Something on which other things depend for support.
1999, Eliezer Geisler, https://books.google.com/books?id=R1IF6h5vQbMC&pg=PA203&dq=%22is+keystone+to%22&hl=en&sa=X&ved=0ahUKEwipl8e83d_LAhVMx2MKHToyAoIQ6AEIIjABv=onepage&q=%22is%20keystone%20to%22&f=false Methodology, Theory, and Knowledge in the Managerial and Organizational ...

Tension between empirical and theoretical knowledge is keystone to sociological and to organizational theories, as early as in Marx's and Weber's frameworks.