[aerospace] Close-out is the process that is completed in preparing an aircraft or spacecraft and its crew for flight. The seven members of the Space Shuttle close-out crew help astronauts strap in and take care of any other last-minute needs that arise. The crew is also responsible for closing and sealing the crew access hatch and are the ...
A transaction which leaves the trade with a zero net commitment to the market. A purchase if the initial transaction was a sale and vice versa. 
A futures transaction where an equal and opposite trade closes an open position. This leaves a... <a target=_blank href='http://www.finance-glossary.com/terms/close-out.htm?id=257&ginPtrCode=00000&PopupMode=false' title='Read full definition of close out'>more</a>
See liquidate.
To undertake a trade to offset an original futures trade eg a trade opened through buying futures contracts would be closed out by selling the same quantity of futures contracts (and vice versa)
Is the action taken by a brokerage firm when a client failed to pay for previously purchased securities. Here, the brokerage firm will sell the aforementioned securities. 
[v] - terminate by selling off or disposing of 2. [v] - terminate
Controlled defensive slide to cover an offensive player.
verb terminate; `We closed out our account`
A phase that encompasses the end of a project. This consists of punch lists, O&M manuals, as-builts/record drawings, warranties, and the overall completion of project work.