ca ‧ dre /ˈkɑːdə, -drə, ˈkeɪdə $ ˈkædri, ˈkɑːdrə/ BrE AmE noun [countable also + plural verb] British English
[ Date: 1800-1900 ; Language: French ; Origin: Italian quadro , from Latin quadrum 'square' ]
a small group of specially trained people in a profession, political party, or military force
cadre of
a cadre of highly trained scientists