adjective
relating to the basis or foundation of something; serving as a base or starting point
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The foundational principles of mathematics are essential for understanding higher-level concepts.
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You need to have a solid foundational knowledge of coding before you can start building your own apps.
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If you want to be a great chef, you gotta nail the foundational cooking techniques first.
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In order to reach new heights in your career, you must first strengthen your foundational skills.