a soldier who serves as an attendant to a superior officer
"the orderly laid out the general's uniform"
a male hospital attendant who has general duties that do not involve the medical treatment of patients
"The orderly wheeled the gurney down the hallway to transport the patient to the radiology department."
A hospital attendant given a variety of non-medical duties.
"The orderly wheeled the patient's bed through the hallway to arrange his belongings in the new ward."
Neat and tidy; possessing order.
"The librarian gently arranged the scattered books on the shelf until they looked neat and tidy."
According to good order or practice; appropriately, in a well-behaved or orderly (adjective) way.
"The students moved through the hallway quietly and remained seated during the fire drill, proving they could behave in an orderly manner even under pressure."