One of the mysteries of the English language finally explained.
1The differentiation of one social class from another; (also) a point of differentiation between social classes, as a characteristic attitude, behaviour, etc.
2A distinction between two classes of objects; (also) a distinction between two objects on the basis of their membership of different classes.
Early 19th century. From class + distinction.
class distinction/ˌklas dɪˈstɪŋ(k)ʃn//ˌklɑːs dɪˈstɪŋ(k)ʃn/
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