How to Say "expiration" in Spanish
The Spanish word for “expiration” is “prescripción” — C1 level.
English → SpanishC1
nounC1formal
end of a valid period

Examples
La prescripción del delito ocurrió después de diez años.
The statute of limitations for the crime occurred after ten years.
El abogado solicitó la prescripción de la deuda.
The lawyer requested the expiration of the debt.
Debemos actuar antes de que llegue el plazo de prescripción.
We must act before the expiration period arrives.
Legal Nouns
In legal Spanish, 'prescripción' refers to the loss (or sometimes gain) of a right due to the passage of time.
Confusing with 'Prescription'
Mistake: “Thinking this meaning only refers to medicine.”
Correction: In legal documents, it almost always means that time has run out for a legal action.
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