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Assistant

a.
  1. Helping; lending aid or support; auxiliary.
  2. (Mil.) Of the second grade in the staff of the army; as, an assistant surgeon.

In the English army it designates the third grade in any particular branch of the staff.
n.

  1. One who, or that which, assists; a helper; an auxiliary; a means of help.
  2. An attendant; one who is present.