A measure adopted by central banks to stimulate an economy when traditional monetary policy measures (like cutting interest rates) have failed. The central bank electronically creates funds in its own bank account to purchase previously-issued government bonds, plus private sector and distressed assets (so companies can raise capital). This serves to create more tradable and liquid markets to help stimulate the economy.
The two-way market price for a given instrument; because it’s two-way, you can buy or sell, according to whether you think prices will rise or fall.
The second currency in a pair (for example USD is the counter currency in GBP/USD). Also see Base currency or variable currency.