Palette an artist’s paint board the set of colors on such a board Not to be confused with palate the roof of the mouth taste a fine palate for gourmet food .Palette definition is a thin oval or rectangular board or tablet that a painter holds and mixes pigments on. How to use palette in a sentence.. Palette definition, a thin and usually oval or oblong board or tablet with a thumb hole at one end, used by painters for holding and mixing colors. See more..Choose Your Words Palette can refer to a range of colors. A platform used for moving things is a pallet. And your preference of flavors in food is your palate..