What is the meaning of fundamentals?

noun

• Any factor that could be considered important to the understanding of a particular business.
  • usage: "fundamentals include a company's growth, revenues, earnings, management, and capital structure"
  • synonyms: fundamental
• The lowest tone of a harmonic series.
  • synonyms: fundamental, fundamental frequency, first harmonic
• Principles from which other truths can be derived.
  • usage: "first you must learn the fundamentals"; "let's get down to basics"
  • synonyms: basics, fundamental principle, basic principle, bedrock