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Day Trader – Speculators who take positions in commodities which are then liquidated prior to the close of the same trading day.

Dealer – An individual or firm that acts as a principal or counterpart to a transaction. Principals take one side of a position, hoping to earn a spread (profit) by closing out the position in a subsequent trade with another party. In contrast, a broker is an individual or firm that acts as an intermediary, putting together buyers and sellers for a fee or commission.

Deficit – A negative balance of trade or payments.

Delivery – An FX trade where both sides make and take actual delivery of the currencies traded.

Department of Communities and Local Government (DCLG) UK House Prices – A monthly survey produced by the DCLG that uses a very large sample of all completed house sales to measure the price trends in the UK real estate market.

Depreciation – A fall in the value of a currency due to market forces.

Derivative – A contract that changes in value in relation to the price movements of a related or underlying security, future or other physical instrument. An Option is the most common derivative instrument.

Devaluation – The deliberate downward adjustment of a currency’s price, normally by official announcement.

Discount Rate – Interest rate that an eligible depository institution is charged to borrow short-term funds directly from the Federal Reserve Bank.

Source:forex.com