When a child incorrectly uses a word to describe a wider set of objects or actions than the word is meant to describe, the child is making an error of

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Overextension occurs when a child applies a word to a broader set of objects or actions than the word is meant to describe. For example, a child may use the word "ball" to describe any round object, including an orange or a balloon. Over-regularisation refers to when a child applies a grammatical rule too broadly or incorrectly, such as saying "goed" instead of "went." Under-extension refers to when a child uses a word to describe a narrower set of objects or actions than the word is meant to describe, such as using the word "dog" only to refer to the family pet rather than all dogs. Fast mapping refers to the process by which children quickly learn and retain new words after just a few exposures to them.

When a Child Incorrectly Uses a Word to Describe a Wider