adjective “fundamental”
base form fundamental (more/most)
- forming the base or core of something
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The book explains the fundamental principles of physics.
- (often with "to" or "for") essential; being necessary for something
Physical strength is fundamental to competitive weightlifting.
noun “fundamental”
singular fundamental, plural fundamentals
- a basic principle, rule, or idea that serves as the essential foundation of something
He studied the fundamentals of physics before attempting complex experiments.
- (in physics) the lowest frequency or tone in a sound or vibration
The fundamental frequency determines the pitch of the note produced by the violin.