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Douglas Harper's Etymology Dictionary
foundational

1680s, from foundation + -al (1). Related: Foundationally.

Wiktionary
foundational

a. 1 of, or relating to a foundation or foundations 2 fundamental or underlying

Usage examples of "foundational".

There are other physicists, however, who are deeply unsettled by the fact that the two foundational pillars of physics as we know it are at their core fundamentally incompatible, regardless of the ultramicroscopic distances that must be probed to expose the problem.

For science students and teachers, I hope this book will crystallize some of the foundational material of modern physics, such as special relativity, general relativity, and quantum mechanics, while conveying the contagious excitement of researchers closing in on the long-sought unified theory.

The problem is this: There are two foundational pillars upon which modern physics rests.

To wake us up so we can see the illusory quality of our relative reality and understand our foundational absolute nature is the goal of the Buddha Dharma.

All of which is true enough, and all of which is foundational (or the sensorimotor starting point), but all of which totally overlooks the further nonreducible developments in the intersubjective sphere, which cannot be recovered in an enactive monological paradigm, but must include an enactive dialogical paradigm as well.

Culture cramming may be a foundational belief of obsessive parenting, but the ECLS data show no correlation between museum visits and test scores.