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We study Refer-to-as relations as a new type of semanticknowledge. Compared to the much studied Is-a relation,which concerns factual taxonomy knowledge, Refer-to-as relationsaim to address pragmatic semantic knowledge. Forexample, a "penguin" is a "bird" from a taxonomy point ofview, but people rarely refer to a "penguin" as a "bird" invernacular use. This observation closely relates to the entrylevelcategorization studied in Prototype Theory in Psychology.We posit that Refer-to-as relationsdoi:10.1609/aaai.v29i1.9489 fatcat:mey4esoqabbl5kaqmnjwg7dhay