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1 Without hue, or represented in black, white, and grey. An achromatic colour, also called a neutral grey or neutral colour, is a mixture of black and white without any chroma and is the lightness component of any colour. See also Hering grey, saturation (1).

2 Capable of refracting or reflecting light without chromatic aberration (3). [From Greek a- without + chroma colour]

Subjects: Psychology.

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