From Longman Dictionary of Contemporary Englishcadreca‧dre /ˈkɑːdə, -drə, ˈkeɪdə $ ˈkædri, ˈkɑːdrə/ noun [countable] GROUP OF PEOPLEa small group of specially trained people in a profession, political party, or military forcecadre of a cadre of highly trained scientistsGRAMMAR: Singular or plural verb?• Cadre is usually followed by a singular verb: A new cadre of leaders has emerged.• In British English, you can also use a plural verb: A new cadre of leaders have emerged.
Examples from the Corpus
cadre• Already, the mayor is creating a cadre of business advisors to start brainstorming more ideas.• The weekends with the cadre of sociable women must have been the happy times.• The cadres, under pressure, singled out alleged culprits on no pretext at all.• But the young cadre made no such move.Origin cadre (1800-1900) French Italian quadro, from Latin quadrum “square” 