ὑπηρέτης

Etymology
From.

Noun

 * 1) An Ancient Greek title, originally for a rower; In later times a title for those who performed any service in a vessel, except the soldiers or marines
 * 2) Any person who acted as the assistant of another, and performed manual labour for him, whether in sacred or profane things; a slave.
 * 3) A title for men by whom the hoplites  were accompanied when they took the field, and who carried the luggage, the provisions, and the shield of the hoplites. (The more common name for this servant of the hoplites was .)

Usage notes
At Athens seems to have been applied to a class of officers. Aristotle (Polit. vi. 5) divides all public offices into three classes, archai or magistracies, epimeleiai  or administrations, and hyperesiai  or services.