Added 10 October 2026 coplanar /kəʊˈpleɪnə(ɹ)/ adjective Categories: Describing WordsRare Words adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about coplanar at Wordnik → Where our words come from → Lying in the same plane. Related Words: two-dimensionalplanarpcbscomplanarequiplanardiplanaruniplanarmultiplanarmonoplanarbiplanalhalfplanarquadriplanar Back to today's word