Entry 2 senses Webster, 1913 Infarction /ĭnfärkʹshən/ · In·farc·tion · IPA /ɪnˈfɑɹk.ʃən/ 01 n. The act of stuffing or filling; 1. The act of stuffing or filling;(Med.) 2. An infarct{2}; as, a cardiac infarction.