foundational

American  

[foun-dey-shuh-nl] / faʊnˈdeɪ ʃə nl /

Rarely foundationary

adjective

1. of or relating to the basis or groundwork on which something rests or is built; needing to be understood or established at the beginning.

   We believe that fostering a strong local community is a foundational component of our inner-city scholarship program, guiding everything else we do.

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Other Word Forms

• foundationally
  adverb

Etymology

Origin of foundational

foundation ( def. ) + -al ¹ ( def. )

Example Sentences

Much of that technology has roots in the 2024 acquisition of two companies, Morton Photonics and SiNoptiq, which added over 40 foundational patents to the company’s portfolio.

From Barron's • May 20, 2026

Some programs used to evaluate their curricula on a three- or five-year cycle because foundational subjects like financial and cost accounting rarely changed.

From The Wall Street Journal • May 18, 2026

Video games like “Half-Life,” “Portal” and “Minecraft” were foundational influences for Parsons, who first started filming videos as a child using his parents’ tablets and cellphones.

From Los Angeles Times • May 14, 2026

The company is simultaneously developing its own internal foundational models that can power on-device AI features.

From MarketWatch • May 1, 2026

“We would forfeit the protection afforded by the foundational covenants of the treaty.”

From "Fablehaven" by Brandon Mull

Related Words

• central
• constitutional
• crucial
• elemental
• elementary
• essential
• indispensable
• integral
• intrinsic
• major
• necessary
• paramount
• principal
• radical
• significant
• structural
• theoretical
• underlying
• vital