Entry 1 sense Webster, 1913 Semi-Pelagianism /(sĕm`ĭ*pē̇*lā"jĭ*an*ĭz'm)/ · Sem·i-Pe·la·gi·an·ism · IPA 01 n. The doctrines or tenets of the Semi-Pelagians. 1. The doctrines or tenets of the Semi-Pelagians.