the system for dealing with the lending and borrowing of funds, especially by governments and large corporations, on a short-term basis
See money market in American Heritage Dictionary 4
noun
The trade in short-term, low-risk securities, such as certificates of deposit and U.S. Treasury notes.
A mutual fund that sells its shares in order to purchase short-term securities, the income from which is distributed among shareholders in the form of additional shares in the fund. Also called money market fund.