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achromaticity

noun
ach·​ro·​ma·​tic·​i·​ty | \ ˌa-krə-məˈtisətē, ˌā-\
plural -es

Definition of achromaticity

1 : the quality or state of being achromatic (as grayness of a color)
2 : degree of being achromatic

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First Known Use of achromaticity

1821, in the meaning defined at sense 1

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The first known use of achromaticity was in 1821

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