1. the fundamental laws of the universe. 2. an example that was fundamental to the argument. 3. a book that underwent fundamental revision. 4. Of or relating to the component of lowest frequency of a periodic wave or quantity. 5. Of or relating to the lowest possible frequency of a vibrating element or system. 6. a fundamental chord. 7. Something that is an essential or necessary part of a system or object. 8. The lowest frequency of a periodically varying quantity or of a vibrating system.
