What is the legal term for an action to recover possession of property unlawfully detained?

The correct term for an action to recover possession of property that has been unlawfully detained is "Replevin." This legal action allows an individual to regain possession of their property when someone else has taken or is holding onto it without legal right. Replevin actions typically involve a court process where the plaintiff claims rightful ownership and requests the return of the property, rather than seeking damages for its value. It serves to restore possession quickly, emphasizing the return of the specific item rather than compensation.

The other terms listed have different legal implications: "Expropriation" generally refers to the process by which a government takes private property for public use, often with compensation. "Recaption" usually involves retaking possession of property that may have been wrongfully taken, but it often implies a more informal or self-help method that may not have the legal backing of a court order. "Reclamation" typically applies to the act of reclaiming something lost or taken, but in a broader context and is often associated with environmental or resource recovery rather than specifically addressing property possession disputes.