Eeveelution: Any evolution of the Pokémon Eevee. It is a fan-created term that combines the word "evolution" with "Eevee".
Why is the Eevee family so popular with Pokémon fans? Perhaps the versatility in the Pokémon that allows for a personalized style of battling? Or maybe they are just too adorable for words...Who knows! But we love them. Even if you say you don't, you secretly do. Just admit it. Anyway, as you probably already know, there are currently 7 known evolutions for Eevee. The types that haven't been made into an evolution are: Ghost, Dragon, Bug, Flying, Ground, Rock, Steel, Poison, and Fighting. You could count Normal as well, though Eevee is normal in it's first stage. The lack of other type evolutions allows for some interesting creations and ideas! Like so:

Here you can see Ghost, Dragon, Flying, Bug, and Normal type Eeveelutions. We currently have an art contest involving new and made up evolutions for Eevee, so join today if you have one in mind.

According to a poll that is still running on my site (sweetcharm.net) Glaceon seems to be the crowd favorite out of 95 people across America with 34% of the total votes. Following Glaceon is Umbreon with 25% of the total votes. Feel free to vote in the poll above! Who knows, it may be different than the previous outcome...