fundamentals

(noun) principles from which other truths can be derived. Synonyms: basics, fundamental principle, basic principle, bedrock. Examples: "First you must learn the fundamentals." "Let's get down to basics."

(noun) any factor that could be considered important to the understanding of a particular business. Synonyms: fundamental. Example: "Fundamentals include a company's growth, revenues, earnings, management, and capital structure."

(noun) the lowest tone of a harmonic series. Synonyms: fundamental, fundamental frequency, first harmonic.