Market Correction: Usually a negative movement of 10% or more in a stock, bond, commodity or index to amend an overvaluation, interrupting an uptrend in the market or an asset. Generally a temporary price decline of a shorter duration than a bear market or recession, although it can herald both.
Source: Investopedia
Marginal Lending Facility: Within the Eurosytem, a national central bank credit facility that is available to any party transacting with the central bank to receive overnight credit at a pre-specified interest rate using eligible collateral. With the new rates announced by the ECB, banks will pay a lower rate when they borrow money from the ECB.
Source: European Central Bank Online Glossary
Mcf: An abbreviation denoting a thousand cubic feet of natural gas. It’s a unit of measurement for natural gas wells; for example, one that produces 600 Mcf of gas per day operates with a daily production rate of 600,000. A single Mcf is equal to approximately 1,000,000 British thermal units (Btu) of energy. The "M" in Mcf refers to one thousand, as in the ancient Roman letter M. One million cubic feet is instead denoted as MMcf.
Source: Investopedia
Mortgage-Backed Security (MBS): A security backed by a mortgage or group of mortgages that represents a claim to the cash flow from the mortgage or group of mortgages, essentially a loan to a home buyer or business from a shareholder. Typically, the mortgage payments are passed through the shareholders on the way to repayment, meaning shareholders will get regular payments of interest and principal.
Source: Investopedia, SEC.gov, PIMCO.com