aide

Meanings

1. 1
   noun

   An assistant.

   The aide rides, along with the president's physician, in the “control car,” third in line in the motorcade.

2. 2
   noun

   an officer who acts as military assistant to a more senior officer

3. 3
   noun

   someone who acts as assistant

4. 4
   noun

   An officer who acts as assistant to a more senior one; an aide-de-camp.

Etymology

Borrowed from French aide ("aid; assistant", as in aide-de-camp (“field assistant”)). More at aid.