| noun | a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct “their principles of composition characterized all their works” |
| noun | a rule or standard especially of good behavior “a man of principle” |
| noun | a basic truth or law or assumption “the principles of democracy” |
| noun | a rule or law concerning a natural phenomenon or the function of a complex system “the principle of the conservation of mass” |
| noun | rule of personal conduct |
| noun | (law) an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature) “the rationale for capital punishment” |
| ratiocinate | verb | reason methodologically and logically |