Entry 1 sense Webster, 1913 Coarticulation /kō'-är-tĭk-ū-lā'-shən/ · Co·ar·tic·u·la·tion · IPA /ˌkoʊ.aɹ.tɪk.juˈleɪ.ʃən/ 01 n. The union or articulation of bones to form a joint. 1. The union or articulation of bones to form a joint.(Anat.)