secret is on the Basic English 850 List.
second - secret - secretary

Pronunciation

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Singular
secret

Plural
secrets

  1. Hidden or unknown information.
    Can you keep a secret?

Adjective

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Positive
secret

Comparative
more secret

Superlative
most secret

  1. Known by a small group; hidden.
    We found her secret diary.
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Usage notes

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  • "Top secret" is often used instead of "most secret."