Definition from Wiktionary, the free dictionary
From French cachet.
- A special characteristic or quality.
- I remember when this diner was a quiet hangout, but lately it seems to be losing its cachet.
- (archaic) A seal, as of a letter.
Usage notes 
- (quality): This word is often used in the negative. e.g., to lose/be losing its/oneʼs cachet.
From Old French cacher.
cachet m (plural cachets)
Related terms 
cachet m (invariable)