The undersecretary is a high-ranking but not the top official, often reporting to a secretary. She worked her way up to undersecretary, just one level below the secretary.
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Government Role
Undersecretaries are involved in specific governmental duties, which can be indicated by their title. The undersecretary for economic affairs handles fiscal policies.
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Formal Use
The term is formal, used in official and political contexts more than in casual conversation. During the ceremony, the undersecretary delivered a speech.