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GCHQ

🔊/ˌdʒiː siː eɪtʃ ˈkjuː/
🔊/ˌdʒiː siː eɪtʃ ˈkjuː/
Government Communications Headquarters
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  1. a British government centre based since the 1950s in Cheltenham, England. It was set up after the Second World War to gather information that is important for national security and to protect government communications.