(1):
(n.) A person or a nation that takes no part in a contest between others; one who is neutral.
(2):
(a.) Neither good nor bad; of medium quality; middling; not decided or pronounced.
(3):
(a.) Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent.
(4):
(a.) Having neither acid nor basic properties; unable to turn red litmus blue or blue litmus red; - said of certain salts or other compounds. Contrasted with acid, and alkaline.
(5):
(a.) Neuter. See Neuter, a., 3.