|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a fool or simpleton; ninny.|
|1.||the nucleus of trained professional servicemen forming the basis for the training of new units or other military expansion|
|2.||a basic unit or structure, esp of specialists or experts; nucleus; core|
|3.||a group of revolutionaries or other political activists, esp when taking part in military or terrorist activities|
|4.||a member of a cadre|
|[C19: from French, from Italian quadro, from Latin quadrum square]|
An elite or select group that forms the core of an organization and is capable of training new members.