• Fundamental analysis
• Fundamental aspect
• Fundamental axiom
• Fundamental basis
• Fundamental change
• Fundamental concept
• Fundamental contradiction
• Fundamental difference
• Fundamental dissimilitude
• Fundamental eigenmode
• Fundamental element
• Fundamental illogicality
• Fundamental incompatibility
• Fundamental issue
• Fundamental misconception
• Fundamental misreading
• Fundamental postulate
• Fundamental precondition
• Fundamental principle
• Fundamental question