Added 9 October 2026 boarder /ˈbɔədə/ noun Categories: PeopleRare Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about boarder at Wordnik → Where our words come from → A tenant in someone's house. Someone who forces their way aboard ship. stand by to repel boarders A pupil who lives at school during term time. Related Words: lodgerroomertenantlesseerenterguestresidentinmatefrontierborderboundaryparlour Back to today's word