What does the word fundamental mean?

Usage examples for fundamental

  1. The most obvious can be readily separated from a fundamental by a simple experiment. – Resonance in Singing and Speaking by Thomas Fillebrown
  2. Mary's objection was fundamental. – Mary Minds Her Business by George Weston
  3. It's a mere difference in fundamental theory which doesn't really matter a rap- except for after dinner purposes. – Gilbert Keith Chesterton by Maisie Ward