Print | Email article to a friend | Last updated: March 31, 2015. Oxytocin is a hormone that acts on organs in the body (including the breast and uterus) and as a chemical messenger in the brain controlling key aspects of the reproductive system including childbirth and lactation, and aspects of human behaviour.
2. something that is exchanged. 3. (Banking & Finance) finance Also called: swap option or swaption a contract in which the parties to it exchange liabilities on outstanding debts, often exchanging fixed-interest-rate for floating-rate debts (debt swap), either as a means of managing debt or in trading (swap trading)
Full Definition of SWAP. transitive verb. 1. a: to give in trade: barter b: exchange 2. 2. intransitive verb. : to make an exchange. â swapÂ·per noun.See swap defined for English-language learners. See swap defined for kids.xamples of SWAP. 1  He swapped his cupcake for a candy bar. 2  I swapped seats with my sister so she could see the stage better. 3  I liked her blue notebook and she liked my red one, so we swapped.