foundational

adjective

foun·​da·​tion·​al fau̇n-ˈdā-sh(ə-)nəl 

: of, relating to, or forming or serving as a base or foundation : fundamental

foundational principles/doctrines

These foundational volumes proved to be, each in its own way, enabling gestures for the growth of sophisticated theories and critical practices in African, Caribbean, and African American literatures.

—Henry Louis Gates, Jr.

Property was, in a sense, foundational to culture, since English political economy rested on the private ownership of land, and the political economy, in turn, largely structured social relations.

—Jill Lepore

Philosophy is a foundational discipline. Not only does it do the spadework that makes the construction of other disciplines possible; it also pays constant attention to the foundations of those disciplines as they are practiced.

—Cognitive Science

foundationally adverb

Examples of foundational in a Sentence

Recent Examples on the Web

Those two are foundational building blocks. —Eric Stephens, New York Times, 15 May 2026

This back-end integration validates the utility of commercial bearer tokens as foundational institutional infrastructure. —Sean Lee, Forbes.com, 15 May 2026

By traversing sonic ground across its 10 tracks that transports listeners from the open expanses of Montana to the Mississippi Hill Country, Bingham and The Texas Gentlemen effectively weave a tapestry that knits together a throughline between foundational Americana genres. —Chris Barilla, PEOPLE, 15 May 2026

Thinners, also byproducts of oil and natural gas processing, are also needed to print circuits onto silicon wafers that are the foundational substrate for chips. —Miranda Jeyaretnam, Time, 15 May 2026

Word History

First Known Use

1657, in the meaning defined above

Rhymes for foundational

• formational
• gestational
• gradational
• locational
• mutational
• notational
• relational
• rotational
• sensational
• translational
• vibrational
• vocational