serving as an essential component
being or involving basic facts or principles
far-reaching and thoroughgoing in effect especially on the nature of something
the lowest tone of a harmonic series
a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct
a rule or standard especially of good behavior
a basic truth or law or assumption
a rule or law concerning a natural phenomenon or the function of a complex system
(law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature)
rule of personal conduct
