American English

Definition of fundamental adjective from the Oxford Advanced American Dictionary

        

    fundamental

     adjective
    adjective
    NAmE//ˌfʌndəˈmɛntl//
     
     
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  1. 1serious and very important; affecting the most central and important parts of something synonym basic There is a fundamental difference between the two points of view. Afundamental change in the organization of health services was required. a question of fundamental importance
  2. 2fundamental (to something) central; forming the necessary basis of something synonym essential Hard work is fundamental to success.
  3. 3[only before noun] (physics) forming the source or base from which everything else is made; not able to be divided any further a fundamental particle
See the Oxford Advanced Learner's Dictionary entry: fundamental