Webster's Revised Unabridged Dictionary · 1913

Neutral

Neutral , adjective

[Latin neutralis, from neuter. See Neuter.]

1.
Not engaged on either side; not taking part with or assisting either of two or more contending parties; neuter; indifferent.
The heart can not possibly remain neutral, but constantly takes part one way or the other. — Shaftesbury
2.
Neither good nor bad; of medium quality; middling; not decided or pronounced.
Some things good, and some things ill, do seem, And neutral some, in her fantastic eye. — Sir J. Davies
3.
(Biology) Neuter. See Neuter, a., 3.
4.
(Chemistry) 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.
Collocations (5)
Neutral axis or Neutral surface (Mechanics) , that line or plane, in a beam under transverse pressure, at which the fibers are neither stretched nor compressed, or where the longitudinal stress is zero. See Axis.
Neutral equilibrium (Mechanics) , the kind of equilibrium of a body so placed that when moved slighty it neither tends to return to its former position not depart more widely from it, as a perfect sphere or cylinder on a horizontal plane.
Neutral salt (Chemistry) , a salt formed by the complete replacement of the hydrogen in an acid or base; in the former case by a positive or basic, in the latter by a negative or acid, element or radical.
Neutral tint , a bluish gray pigment, used in water colors, made by mixing indigo or other blue some warm color. the shades vary greatly.
Neutral vowel , the vowel element having an obscure and indefinite quality, such as is commonly taken by the vowel in many unaccented syllables. It is regarded by some as identical with the u in up, and is called also the natural vowel, as unformed by art and effort; it is also called the indefinite vowel. It is symbolized in some phonetic alphabets by the schwa (s). See Guide to Pronunciation, § 17.

Neutral , noun

A person or a nation that takes no part in a contest between others; one who is neutral.
The neutral, as far as commerce extends, becomes a party in the war. — R. G. Harper