To belong to or be connected with something as a rightful part or responsibility.
From Old French 'apertenir,' combining 'à' (to) and 'pertenir' (to belong), which came from Latin 'pertinere' meaning 'to stretch toward' or 'relate to.' The meaning shifted from physical extension to abstract belonging.
This word is a legal and formal cousin of 'pertain'—while 'pertain' feels modern, 'appert' preserves the older French pathway into English, and you'll find it in historical documents and legal texts where precision about ownership and duty matters most.
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