Definitions, please: 1. beating 2. roughness

Gentlemen/ladies,

Could anyone post the universally agreed upon definitions of both beating and roughness? Beats certainly are a term that I am familiar with, as are many musicians, but 'roughness' seem to be much more of a descriptor and not a phenomenon or artifact.

I did some playing around with soundfiles today based on Paul's post, and will comment once I see that it won't devolve into semantic circle-dancing...

Cheers,
Jon