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Many statements are true, which make no claim to give a definition; no one in saying that buttercups are yellow imagines that he is giving a definition of buttercups. …Others may maintain that what causes an action to be good is the fact that it produces pleasure, but a statement of what causes an action to be good is not a definition of goodness; we might similarly say that light of a certain wavelength causes the colour yellow, but this would not be a definition of yellow.

…It can be stated that yellow is the complementary colour of blue, that it is the limit of a series of colours passing from red through orange, that it is the colour of certain natural objects like buttercups and sulphur, and so on.

(W. Lillie, An Introduction to Ethics, 6.4)

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