Children are likely to treat new words as labels for unfamiliar objects,a tendency referred to as

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The mutual exclusivity bias is the tendency of children to assume that each object has only one label and that if an object already has a label, a new word they encounter must refer to an unfamiliar object. This helps explain how children can rapidly expand their vocabulary by associating new words with objects that don't already have a name in their lexicon.

Children Are Likely to Treat New Words as Labels for Unfamiliar