Though 18-month-old Saturn knows the word "car," she only uses it when referring to her mother's sedan (i.e., she does not use it to describe any other vehicle). Saturn's linguistic limitation is best described as involving

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Underextension refers to the limited use of a word to refer to only a specific object or situation, and not using it in other appropriate situations. In this case, Saturn only uses the word "car" to refer to her mother's sedan, but not to any other vehicles, which is a form of underextension.

Though 18-Month-Old Saturn Knows the Word "Car," She Only Uses