- 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. (noun)
- A substance, such as saliva, mucus, tears, bile, or a hormone, that is secreted. (noun)
- The act of concealing something in a hiding place. (noun)
- The act of stealing something secretly. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.