fundamental

Far-reaching and thoroughgoing in effect especially on the nature of something.

“the fundamental revolution in human values that has occurred”

“the book underwent fundamental changes”

Being or involving basic facts or principles.

“the fundamental laws of the universe”

“a fundamental incompatibility between them”

Serving as an essential component.

“an example that was fundamental to the argument”

“computers are fundamental to modern industrial structure”

The lowest tone of a harmonic series.

Any factor that could be considered important to the understanding of a particular business.

“fundamentals include a company's growth, revenues, earnings, management, and capital structure”