Neutral

[1] (N) The neutral position of a transmission is the gear position where the engine is unable to drive the wheels. It is usually placed between reverse and one of the forward gears in automatic transmissions; and is located centrally in manual transmissions.
[2] Something that does not have any distinctive characteristics.
[3] A charactristic of handling where both front and rear wheels have the same amount of traction so that neither one has a tendency to slide.
[4] Something that is neither an alkaline nor acid, usually with a pH of 7.