Entry 2 senses Webster, 1913 Excretion /ĭk-skrēsh'-ən/ · Ex·cre·tion · IPA /ɪkskrˈiːʃən/ 01 n. The act of excreting. 1. The act of excreting. “To promote secretion and excretion.” — Pereira. 2. That which is excreted; excrement.