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 personnel; nucleus; core
3 a member of a cadre
(C19: from French, from Italian quadro, from Latin quadrum square)
English Collins Dictionary - English Definition & Thesaurus
core, framework, hard core, infrastructure, key group, nucleus
English Collins Dictionary - English synonyms & Thesaurus
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