1. (noun) 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. (adj) fundamental, fundamental frequency, first harmonic
the lowest tone of a harmonic series
3. (adj) 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"
4. (adj) fundamental, rudimentary, underlying
being or involving basic facts or principles
"the fundamental laws of the universe"; "a fundamental incomatibility between them"; "these rudimentary truths"; "underlying principles"
5. (adj) 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"
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Definition of 'fundamental' 
