Psnarf wrote:Metric: "a mathematical function that associates a real nonnegative number analogous to distance with each pair of elements in a set such that the number is zero only if the two elements are identical, the number is the same regardless of the order in which the two elements are taken, and the number associated with one pair of elements plus that associated with one member of the pair and a third element is equal to or greater than the number associated with the other member of the pair and the third element" -merriam-webster.com
No wonder nobody has yet to master the English language. That sentence ranks right up there with the ancient Germanic dialect used in the Voynich Manuscript (it's plaintext, not a cipher, just an obscure language most linguists rarely encounter), or Beowulf.
That's a perfectly reasonable definition, and a perfectly reasonable use of English. It's an example of jargon, language that utilizes words and expressions intended for specialists (in this case, mathematicians). In reality, the above definition is actually written symbolically, and any translation into English is, at best, an approximation of its true meaning.