The neutral alignment (often referred to as true neutral) is without prejudice or compulsion. In 4th edition mechanics for Dungeons & Dragons neutral is found under the umbrella of the unaligned alignment.
A neutral character does what seems to be a good idea. He doesn't feel strongly one way or the other when it comes to good vs. evil or order vs. chaos. He thinks of good as better than evil--after all, he would rather have good neighbours and rulers than evil ones. Still, he isn't personally committed to upholding good in any abstract or universal way.
Severus Snape is a good example of Neutral alignment