Definition of "Fundamental" :
noun: the lowest tone of a harmonic series
noun: 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."
adjective: serving as an essential component
"An example that was fundamental to the argument."
adjective: being or involving basic facts or principles
"The fundamental laws of the universe."
adjective: far-reaching and thoroughgoing in effect especially on the nature of something
"The fundamental revolution in human values that has occurred."