- secretion [si krē′shən]n.[MFr < L secretio, separation < secretus: see SECRET]1. the act of hiding or concealing something2.a) a process in which a gland, tissue, etc. produces a biochemical and releases it into the organism for special use by the organism or for excretionb) the substance thus released, including digestive juices, hormones, and perspiration
English World dictionary. V. Neufeldt. 2014.