conspicuousness; prominence; distinctiveness
Often used for something that stands out visually, especially a striking color or unique quality. Common in phrases like 異彩を放つ (to stand out, to be strikingly different).
Her red dress stood out conspicuously at the party.
The painter's works have a distinctive prominence.
isolated gain in a weak market
Compound of 異 (い, 'different, unusual') and 彩 (さい, 'coloring, hue'), literally 'unusual coloring'. The meaning extended from a striking color to any conspicuous or distinctive quality.