metameric pair

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Definition from Glossary

A pair of objects whose colors match when viewed in a described way, but which do not match if the viewing conditions are changed. Thus a metameric pair of samples exhibit the same tri-stimulus values for a described set of viewing conditions (observer, light source, geometry of the illumination and viewing arrangement) but have different spectral distributions. Hence, they exhibit a match that is conditional

Pronunciation
me˘t′a-mer′ik pâr