an aide-de-camp.
an assistant or helper, especially a confidential one.

1770–80, Americanism; < French: helper; see aid

1. aid, aide (see usage note at aid) ; 2. aides, aids, AIDS.

See aid. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aide (eɪd)
1.  an assistant
2.  social welfare an unqualified assistant to a professional welfare worker
3.  short for aide-de-camp

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1777, short for aide-de-camp (1660s), from Fr., lit. "camp assistant."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
When they ran out of tunes they were reprimanded by an aide.
Turned out they wanted me to act as an aide to the commodore.
The government has yet to recover from a corruption scandal earlier this year
  involving an aide.
The arrest of his brother's aide was the final straw.
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