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Definition of House number
1. Noun. The single object or multiple objects attached to a building (or an object adjacent to it such as a mailbox or post) to display the street address assigned to that structure. ¹
2. Noun. The street address numbers painted on a building (or an object such as a mailbox or post near the building), or painted on the curb of the street in front of the building. ¹
¹ Source: wiktionary.com