The first time John hears the word "adults" is when his father explains to him that the locked cabinet is for "adults, not children." John uses the contrastive use of the familiar word "children" with the unfamiliar word "adults" to learn this new word. John has learned the new word by a process referred to as:

Question

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Fast mapping is a process by which children learn new words by mapping them onto existing concepts. In this case, John maps the new word "adults" onto the familiar concept of "children."

The First Time John Hears the Word "Adults" Is When