Also means
notice
Usage Note
feststellen is separable, joining fest (firm) and stellen (to place) to mean establishing a fact or noticing something — Ich stelle fest, dass ... ('I note that ...'). It also means to lock something in place, as with a brake. The prefix detaches in main clauses.
Examples
"Der Arzt stellt eine Krankheit fest."
Natural Translation
The doctor diagnoses an illness.
Literal Translation
The doctor places an illness firm.

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