Source : Webster's Revised Unabridged Dictionary (1913)

Orderly \Or"der*ly\, a.
   1. Conformed to order; in order; regular; as, an orderly
      course or plan. --Milton.

   2. Observant of order, authority, or rule; hence, obedient;
      quiet; peaceable; not unruly; as, orderly children; an
      orderly community.

   3. Performed in good or established order; well-regulated.
      ``An orderly . . . march.'' --Clarendon.

   4. Being on duty; keeping order; conveying orders.
      ``Aids-de-camp and orderly men.'' --Sir W. Scott.

   {Orderly book} (Mil.), a book for every company, in which the
      general and regimental orders are recorded.

   {Orderly officer}, the officer of the day, or that officer of
      a corps or regiment whose turn it is to supervise for the
      day the arrangements for food, cleanliness, etc. --Farrow.

   {Orderly room}.
      (a) The court of the commanding officer, where charges
          against the men of the regiment are tried.
      (b) The office of the commanding officer, usually in the
          barracks, whence orders emanate. --Farrow.

   {Orderly sergeant}, the first sergeant of a company.

Orderly \Or"der*ly\, adv.
   According to due order; regularly; methodically; duly.

         You are blunt; go to it orderly.         --Shak.

Orderly \Or"der*ly\, n.; pl. {Orderlies}.
   1. (Mil.) A noncommissioned officer or soldier who attends a
      superior officer to carry his orders, or to render other
      service.

            Orderlies were appointed to watch the palace.
                                                  --Macaulay.

   2. A street sweeper. [Eng.] --Mayhew.

Source : WordNet®

orderly
     n 1: a soldier who serves as an attendant to a superior officer;
          "the orderly laid out the general's uniform"
     2: a male hospital attendant who has general non-medical duties
        [syn: {hospital attendant}]

orderly
     adj 1: devoid of violence or disruption; "an orderly crowd
            confronted the president" [ant: {disorderly}]
     2: according to custom or rule or natural law [syn: {lawful}, {rule-governed}]
     3: not haphazard; "a series of orderly actions at regular
        hours" [syn: {systematic}]
     4: marked by or adhering to method or system; "a clean orderly
        man"; "an orderly mind"; "an orderly desk"
     5: marked by system or regularity or discipline; "a quiet
        ordered house"; "an orderly universe"; "a well regulated
        life" [syn: {ordered}, {regulated}]
     6: marked by an orderly, logical, and aesthetically consistent
        relation of parts; "a logical argument"; "the orderly
        presentation" [syn: {consistent}, {logical}, {ordered}]