| principle | an explanation of the fundamental reasons (especially an explanation of the working of some device in terms of laws of nature) |
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| principle | a basic truth or law or assumption |
| principle | a rule or law concerning a natural phenomenon or the function of a complex system |
| principle | a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct |
| principle | a rule or standard especially of good behavior |
| principle | rule of personal conduct |
| principle | (physics) the principle that an observer has no way of distinguishing whether his laboratory is in a uniform gravitational field or is in an accelerated frame of reference |
| principle | (hydrostatics) the volume of a body immersed in a fluid is equal to the volume of the displaced fluid |
| principle | the principle that entities should not be multiplied needlessly |
| principle | (physics) a universal law that states that the laws of mechanics are not affected by a uniform rectilinear motion of the system of coordinates to which they are referred |
| principle | the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point |
| principle | (geology) the principle that in a series of stratified sedimentary rocks the lowest stratum is the oldest |