"fundamental" in the noun sense

1. fundamental

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"

2. fundamental, fundamental frequency, first harmonic

the lowest tone of a harmonic series

"fundamental" in the adjective sense

1. cardinal, central, fundamental, key, primal

serving as an essential component

"a cardinal rule"

"the central cause of the problem"

"an example that was fundamental to the argument"

"computers are fundamental to modern industrial structure"

2. fundamental, rudimentary, underlying

being or involving basic facts or principles

"the fundamental laws of the universe"

"a fundamental incompatibility between them"

"these rudimentary truths"

"underlying principles"

3. fundamental, profound

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"

"committed the fundamental error of confusing spending with extravagance"

"profound social changes"

Source: WordNet® (An amazing lexical database of English)

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