·

fundamental (EN)
adjective, noun

adjective “fundamental”

base form fundamental (more/most)
  1. forming the base or core of something
    The book explains the fundamental principles of physics.
  2. (often with "to" or "for") essential; being necessary for something
    Physical strength is fundamental to competitive weightlifting.

noun “fundamental”

singular fundamental, plural fundamentals
  1. a basic principle, rule, or idea that serves as the essential foundation of something
    He studied the fundamentals of physics before attempting complex experiments.
  2. (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.