The act of secreting or concealing; as, the secretion of dutiable goods.
- The process of secreting a substance, especially one that is not a waste, from the blood or cells: secretion of hormones; secretion of milk by the mammary glands.
- A substance, such as saliva, mucus, tears, bile, or a hormone, that is secreted.
- The act of concealing something in a hiding place.
- The act of stealing something secretly.