neutral

adjective

• 1not helping or supporting either side in a conflict, disagreement, etc.; impartial:during the Second World War, Portugal was neutral
• belonging to an impartial party, country, or group:on neutral ground

• 2having no strongly marked or positive characteristics or features:the tone was neutral, devoid of sentiment a fairly neutral background will make any small splash of color stand out
• Chemistry neither acid nor alkaline; having a pH of about 7.
• electrically neither positive nor negative.

noun

• 1an impartial or unbiased country or person:he acted as a neutral between the parties Sweden and its fellow neutrals

• 2a neutral color or shade, especially light gray or beige.

• 3a disengaged position of gears in which the engine is disconnected from the driven parts:she slipped the gear into neutral

• 4an electrically neutral point, terminal, conductor, or wire.