Entry 1 sense Webster, 1913 jocoserious /(jō`kō̇*sē"rĭ*ŭs)/ · jo·co·se·ri·ous · IPA /ˌd͡ʒəʊkəʊˈsɪəɹiəs/ 01 a. Mingling mirth and seriousness. 1. Mingling mirth and seriousness.