A dove is a central bank policymaker who favours lower interest rates and looser monetary policy to support growth and employment. The label is applied to members of bodies such as the Federal Reserve, the European Central Bank, and the Bank of England.
A dove tends to back lower rates because cheaper borrowing can lift consumer spending, business investment, and credit growth. When the economy slows, a dove may also support quantitative easing, bond purchases, or other liquidity measures to keep financial conditions easy.
A dove is the opposite of a hawk, who favours higher interest rates to keep inflation in check. Traders watch the balance between the two on a central bank's committee, because a dovish shift tends to weaken the currency and support risk assets such as shares, while a hawkish shift tends to do the reverse.
The Federal Reserve releases a policy statement that hints rates may be cut if growth slows further. You read the statement as dovish, because it leans towards looser policy.
On a dovish signal, the US dollar may weaken as traders price in lower interest rates. Stock indices may rise at the same time, on the prospect of cheaper borrowing and easier liquidity conditions.