fundamental

/ˌfʌndəˈmɛntəl/

noun

(usually in the plural) A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; an essential part
"one of the fundamentals of linear algebra"
The lowest frequency of a periodic waveform.
The lowest partial of a complex tone.

adjective

Pertaining to the foundation or basis; serving for the foundation.
Essential, as an element, principle, or law; important; original; elementary.
"A need for belonging seems fundamental to humans."

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