A hospital attendant given a variety of non-medical duties.
A soldier who carries out minor tasks for a superior officer.
Adverb
orderly
(now rare) According to good order or practice; appropriately, in a well-behaved way. from 15th c.
ShakespeareYou are blunt; go to it orderly.
(obsolete) In order; in a particular order or succession; with a suitable arrangement. 15th-19th c.
1603, John Florio, translating Michel de Montaigne, Essays, II.12:Thus orderly marshaled, they take their course and swim whither their journey tends, as broad and wide behind as before ....
1624, John Smith, Generall Historie, in Kupperman 1988, p. 149:And in the Tombe which is an arch made of mats, they lay them orderly.