Relating to or of the nature of colouration; concerning the pattern, distribution, or scheme of colors.
From 'colouration' + '-al' (adjectival suffix). This technical adjective is used primarily in biological and natural history contexts to describe aspects related to color patterns.
Scientific language creates words like 'colourational' to be incredibly specific—when a biologist uses this instead of just 'color,' they're signaling they mean the organized PATTERN of color, not just random coloring.
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