Appertain/ˌæpərˈteɪn/ Definition 1 of 3Pro Tip 1/3Part of a Whole Think of 'appertain' as a puzzle piece that fits into a larger picture. The rights that appertain to citizenship. Pro Tip 2/3Connected Concept Use 'appertain' to show a clear, direct connection between ideas or functions. The duties that appertain to the office of President. Pro Tip 3/3Academic Tone More common in academic texts, suggesting a formal context. Topics that appertain to Classical studies.