top secret

adjective
🔊/ˌtɒp ˈsiːkrət/
🔊/ˌtɑːp ˈsiːkrət/
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  1. that must be kept completely secret, especially from other governments(尤指对他国政府)最高机密的,绝密的
    • This information has been classified top secret.这一情报被归为绝密类别。🔊🔊
    • top-secret documents绝密文件