Definitions

foundational

[foun-dey-shuh-nl] / faʊnˈdeɪ ʃə nl /

ADJECTIVE

bottom

Synonyms

STRONG

base basement basic ground last primary radical underlying

WEAK

basal lowermost lowest meat-and-potatoes nethermost rock-bottom undermost

Antonyms

STRONG

secondary

WEAK

highest top

ADJECTIVE

elementary

Synonyms

STRONGEST

elemental fundamental rudimentary straightforward underlying

WEAK

ABCs abecedarian basal beginning child's play clear duck soup easy essential facile initial introductory meat and potatoes original plain prefatory preliminary primary primitive primo simplest simplex simplified substratal uncomplex uncomplicated

Antonyms

STRONGEST

additional advanced extra secondary

WEAK

abstruse complex complicated compound difficult hard intricate involved

ADJECTIVE

fundamental

Synonyms

STRONGEST

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

STRONG

bottom cardinal first key organic original primary prime primitive requisite supporting

WEAK

axiological axiomatic basal bottom-line constitutive grassroots meat-and-potatoes primordial rudimentary substratal substrative sustaining underived

Antonyms

STRONGEST

accessory auxiliary extrinsic inessential insignificant learned least lesser minor needless nonessential secondary trivial unimportant unnecessary

WEAK

additional advanced extra subordinate

ADJECTIVE

lowermost

Synonyms

WEAK

basal base basement basic ground last lowest meat-and-potatoes nethermost primary radical rock-bottom underlying undermost

ADJECTIVE

nethermost

Synonyms

WEAK

basal base basement basic deepest ground last lowermost lowest meat-and-potatoes primary radical rock-bottom underlying undermost

ADJECTIVE

primary/prime

Synonyms

WEAK

basal beginning bottom central elemental elementary essential first introductory meat-and-potatoes original primitive principal radical rudimentary simple three R's ultimate underivative underived underlying

Antonyms

WEAK

auxiliary latest least minor secondary supplemental

ADJECTIVE

radical

Synonyms

STRONGEST

profound

STRONG

basal bottom cardinal constitutional essential native natural organic original primary primitive

WEAK

deep-seated inherent innate intrinsic meat-and-potatoes primal thoroughgoing underlying vital

Antonyms

STRONG

inessential minor secondary unimportant

WEAK

extrinsic nonessential superficial

ADJECTIVE

rudimental

Synonyms

WEAK

ABCs abecedarian basal basic beginning child's play clear duck soup easy elemental essential facile fundamental initial introductory meat and potatoes original plain prefatory preliminary primary primitive primo rudimentary simplest simplex simplified straightforward substratal uncomplex uncomplicated underlying

ADJECTIVE

undermost

Synonyms

WEAK

basal base basement basic ground last lowermost lowest meat-and-potatoes nethermost primary radical rock-bottom underlying

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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

Oklo cleared a major regulatory hurdle last week when the Nuclear Regulatory Commission approved a foundational rulebook for its Aurora power plant.

From Barron's • May 13, 2026

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

From MarketWatch • May 1, 2026

“It was foundational and had such a wonderful impact in creating a more multiracial democracy where our representatives look more like the general population,” Klein said.

From Salon • Apr. 30, 2026

Discovery is not in itself a scientific idea but rather an idea that is foundational for science: we might call it a metascientific idea.

From "The Invention of Science" by David Wootton

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foundational

Example Sentences

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Vocabulary lists containing foundational

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