physical phenomenon
Noun
Meaning
a natural phenomenon involving the physical properties of matter and energy
Source: WordNetHypernyms
Hyponyms
Examples
Empirical evidence can never establish mathematical existence--nor can the mathematician's demand for existence be dismissed by the physicist as useless rigor. Only a mathematical existence proof can ensure that the mathematical description of a physical phenomenon is meaningful.
Since we seek to know what is the physical phenomenon we perceive, we must first enunciate this proposition, which will govern the whole of our discussion: to wit- Of the outer world we know nothing except our sensations.