cach ‧ et /ˈkæʃeɪ $ kæˈʃeɪ/ BrE AmE noun [singular, uncountable]
[ Date: 1600-1700 ; Language: French ; Origin: 'official mark pressed on to a document' , from cacher ; ⇨ ↑ cache 1 ]
formal if something has cachet, people think it is very good or special SYN kudos :
It’s a good college, but lacks the cachet of Harvard.