Etymology
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aide (n.)

"officer whose duty is to receive and communicate the orders of a general officer," 1777, short for aide-de-camp (1660s), a French term in English, literally "camp assistant" (see aid (n.)). Plural of the full term is aides-de-camp.

updated on November 29, 2016

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Definitions of aide from WordNet

aide (n.)
an officer who acts as military assistant to a more senior officer;
Synonyms: adjutant / aide-de-camp
aide (n.)
someone who acts as assistant;
Synonyms: auxiliary
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.