
Certain
Indirect Reference
Used when you know the specifics but choose not to name them directly.

A certain document needs your attention.
General to Specific
Starts a sentence generally and narrows down to something specific unmentioned.

There's a certain charm to this place.
Implying Secrets
Can imply you know more than you're saying, creating a sense of secrecy.

A certain individual has the answers.
Compare with
AssureConfirmDefiniteEstablishIndubitableReliableSureTrustworthyUndeniable
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