(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.
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.