top-secret

American  

[top-see-krit] / ˈtɒpˈsi krɪt /

adjective

1. bearing the classification top-secret, the highest level of classified information.

2. limited to persons authorized to use anything so classified.

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top-secret British  

adjective

1. containing information whose disclosure would cause exceedingly grave damage to the nation and therefore classified as needing the highest level of secrecy and security

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Etymology

Origin of top-secret

First recorded in 1940–45; top ¹ + secret

Example Sentences

By then I was already working on top-secret projects.

From Literature

It was there that Ms Ponting became one of thousands of people experimented on as part of the CIA's top-secret research into mind control.

From BBC

He’d be trained to fly a new kind of airplane, a top-secret design.

From Literature

Now, heading into their fourth winter of war, the country’s energy suppliers are banking on a network of massive, U.S.-designed batteries held at top-secret locations to help keep the lights on.

From The Wall Street Journal

But it was just a ruse - according to the account delivered by the Pentagon - a decoy to distract from the top-secret flights heading straight for Iran over the Atlantic.

From BBC