Who Owns the Standard Definition of Evolution

Can anyone provide a concise definition of Evolution, one that would find concurrence amongst most/all serious evolutionists, and one against which all descriptions of Evolution should be calibrated? "Natural selection" and "survival of the fittest" are woefully lacking, of course, and explanations of evolution that require an essay or a book lose focus of the fundamental mechanics of evolution. Two or three sentences, perhaps a paragraph, should be enough to provide an overall but thorough definition.I suspect that the everyday layman's nebulous understanding of Evolution can be summed up by Zallinger's "March of Progress", sadly, and until there is a standard definition to which all can refer the Evolution debate will meander pointlessly.