What is the meaning of Order?

Order is a set of instructions with the intent of executing a transaction. The following is a list of order types. See: All or None (AON) or All or Nothing, Buy on Close, Buy on Opening, Contingent, Discretionary, Non-Discretionary, Do Not Reduce (DNR), Exchange for Physicals (EFP), Fill or Kill (FOK), Good Till Canceled (GTC), Immediate or Cancel (IOC), Limit (LMT), Market, Market if Touched (MIT), Market on Close (MOC), Market on Opening, Not Held, One Cancels the Other (OCO), Open Order, Sell on Close, Sell on Opening, Stop (STP), Stop Limit (STP LMT), and various combinations as with spreads, options, and other instruments.