A scientific theory that all life on earth descended from a common ancestor. Evolution has been repeatedly proven and observed time and time again, yet most of the morons writing definitions for Evolution on urbandictionary.com choose to ignore that.

A nightclub in Bristol where post-townie single mums and office girls congregate to consume vast quantities of alcohol as preparation for the next days paid sick leave. Often used as an alternative to a social life when one is unavailable.

A WWE faction composed of Triple H, Randy Orton(Formally), Batista, and Ric Flair

A popular haunt for (cockmasters). Possibly the greatest nightclub on planet Earth. Whether it be vodka on a Thursday or jelly baby on a Saturday, there's no place like Evo.

A person or car that changes shape or name frequently. A liar.

1. The process by which one state changes into another. Anything which is not static evolves over time. The word evolution specifically excludes any connotation of improvement or progress, so even 'negative' changes are evolution. In biology, this definition is often observed in terms of the change of gene frequencies in natural populations. There is no controversy about this definition.

2. The theory that species give rise to other species. This process of speciation can be accomplished in a number of ways, all of which must result in two (or more) populations becoming genetically isolated. This can be accomplished physically (allopatry and peripatry) or through division of patch types or through behavioral mechanisms (sympatry). This has been observed at low taxonomic levels. For instance, wheat is a modern species resulting from 2 instances of non-disjunction and one hybridization event that all occurred within the last 5000 years. The original plant has been identified from seeds from tombs in Egypt.

The creation of new higher level taxa is often referred to as macroevolution by non-scientists, but this usage is incorrect. The only difference between the origins of higher taxa and species is time. Today's species will eventually give rise to genera as they continue to diverge from their sister-taxa and continue to speciate themselves. All higher taxa were once just a species. Macroevolution properly refers to selection that operates above the species level, such as the selective pressure across the K-T boundary on gastropods which favored genera (but not species) with wide geographic ranges.

I'll note that theory is the most certain science ever is. In this case, it means that over the last century and a half, plus the observations from before the theory's proposal, no evidence has been found that contradicts the theory of evolution. By the same token, gravity is a theory, and thermodynamics is a theory. 'Law' is just scientific shorthand for a theory that no one thinks will ever be disproved, and may soon be applied to evolution.

Evolution, the combination of such processes as Natural Selection, Sexual Selection, and others, is the subsequent collection of scientific processes that eventually change one organism into another. It is important to discount a few widely held myths here that Creationists often erroneously use to discount Evolution, bringing up half-baked ideas about how one or more "facts" disprove evolution, without bothering to actually know what they're talking about. However, a little care and attempt at education can easily clear up these mistakes:
1.) Evolution does NOT necessarily dictate that animals (or plants, or fungi, or whatever you fancy) must evolve into something more complex. If all animals over the size of cockroaches were wiped out tomorrow, that would be a form of evolution: the Cockroaches and smaller animals would be the surviving species, and "Survival of the Fittest" (a common saying used in evolution) would hold true.

2.) Evolution does NOT, I repeat NOT suggest that humans "magically appeared from crawling fish". Evolution takes time. HUGE amounts of time. We're talking about half a billion years here (~500,000,000)for the total evolution from the first protochordates into the modern Homo sapiens. Not a couple days. Not even a couple centuries. This time span is so long that it's often hard to comprehend. The changes were gradual, as some random "mistakes" in our DNA made some animals better able to adapt, and others not as able to adapt. It is NOT like throwing sand in the air and having it come down as a sand castle. It is, however, like sprinkling little tiny bits of sand here and there - sometimes a grain at a time - and eventually building up to a sandcastle. And sometimes having bits of the sandcastle knocked down.

3.) Species that died out, such as Homo neanderthalis (Neaderthal Man) are not counterexamples. In fact, it shows that two different species, with two different natural "sets of equipment", have different ways (and thus chances) of surviving or outlasting eachother. We and Neanderthals DID stem from the same common ancestor. However, whereas Neanderthals had stocky, tough, but not to bright build, we went the lean and brainy root. That was fine for a little while, but soon we outcompeted them, and they died out.

4.) In regards to the comment above that some species were found in the wrong area: The earth moves. Ever see a volcano? An earthquake? Rocks don't always just sit there.

5.) Any educated biologist will not respond by saying "oh, you're right, evolution didn't happen."

1. In biology: Descent with modification. Change in the genetic composition of a population during successive generations, as a result of natural selection acting on the genetic variation among individuals, and resulting in the development of new species.

2. In everyday speech: A gradual process in which something changes into a different and usually more complex or better form.

Basically, it's how creatures, and plants were made a billion years ago, and how they changed (evolved). According to most Christan's, this is 'just a theory', as they like to believe that God did it. All of it. And that science is wrong. That's like saying "Oh, gravity's just your wacky, blasphemous theory." Jesus Christ, people! This isn't the 1600's any more. We have highly educated, trained, and intelligent people spending billions of dollars to tell you how bugs have changed in the last million years. It's called fucking science, and science (sigh-ents) is what us normal, non-God fearing people accept as real. Even the fucking Taliban accept science to some level. Chemistry, and physics goes into that bomb making.