The phrase "a secondary security" is correct and usable in written English.
It can be used in contexts related to finance, law, or real estate, where it refers to a type of collateral or guarantee that is secondary to a primary security.
Example: "In the event of default, the lender may claim the assets tied to a secondary security to recover losses."
Alternatives: "subordinate security" or "junior security".
However, both the door to his den and a secondary security door had not been properly secured.
"The officer took his fingerprints and then ordered him to a secondary security check room".
In September 2009, he accused TSA agents at the Salt Lake City airport of unfairly targeting him for a secondary security review because of his opposition to granting them collective bargaining rights.
The fifth hijacker, Hani Hanjour, believed to have been the person who flew Flight 77, passed through Dulles security that morning without being subjected to a secondary security check, according to the video.
Passengers transferring from, say, Frankfurt, en route to, say, Washington, will then be able to shave roughly 10 minutes off their connections and avoid a secondary security screening before boarding their onward flight.
Even airport scans are typically used only as a secondary security measure, he points out.
If your carrier isn't listed, you might want to check if they employ a similar secondary security code to your account to prevent any abuse.
Avoid second liens for borrowed money with a lien on "your other collateral (secondary security)." In the USA "informal, verbal, unwritten agreements" for real estate are not enforceable.
Both inciting tragedies are shown, or at least suggested, by a secondary camera — security footage of the construction accident, a series of eerie videos shot on Ève's phone — and that sense of chilly, detached observation persists inside the Laurents' home, where no tragedy seems capable of disrupting the family's routine.
Nearly all Muslims have at some point been subject to secondary security screening selection, but being thrown off a plane was an entirely new level of humiliation for me.
If I don't say something, who will?" Hugh Handeyside, from the American Civil Liberties Union [ACLU], explains that repeatedly having "SSSS" (secondary security screening selection) printed on your boarding pass is a "strong indication" your name has made it to a subset of the US government's sprawling terrorism watchlist.
