An individual who is assigned to an officer, or a person in authority, to facilitate the work or needs of others: Nate was assigned as an orderly to work with his Commanding Officer to complete the necessary reports about the military parade that took place the previous morning.

Jake works in a hospital as an orderly and does various things; such as, moving patients from one place to another, helping with the needs of the medical staff, etc.

Neat, properly arranged, tidy, and put together in a manner that makes information, etc. useful and accessible: In his lecture, Professor Davis proceeded in an orderly manner, describing the development of Medieval history.