The Meaning of Al-Tirmidhi's Statement at the End of the Hadith: (Hasan Gharib)

Question:
In some of the hadiths narrated by Al-Tirmidhi, he says at the end of the hadith: "Hasan Gharib." What is the meaning of a "Hasan Gharib" hadith? Is it weak, or is it authentic?

Answer:
This is a term used by Al-Tirmidhi (may Allah have mercy on him). If a hadith is not narrated except through a single route, he says: "Hasan Gharib." If its chain of narration is sound, or if it has corroborating narrations, he says of it: "Hasan Gharib." If it hinges on a single person, or is relatively rare—relative rarity—if it is through the route of one person, who transmitted it uniquely from another person, even if it has other routes, it is rare relative to that person. For example, it might be rare from the narration of Malik, but not rare from the narration of others; it is well-known from the narration of someone other than Malik, but he did not transmit it uniquely, or some narrators transmitted it uniquely from Malik; in that case, it is rare through the route of Malik. This is called relative rarity through the route of Malik, or through the route of Al-Shafi'i, or through the route of Waki', or Ahmad, or the like.
As for absolute rarity, that is what is narrated by a single individual, where it hinges on a single individual, a single Companion, or a single Successor, or a single Successor of the Successors. This is called "Gharib." Yes.

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