from
The Collaborative International Dictionary of English v.0.48
Rear \Rear\, a.
Being behind, or in the hindmost part; hindmost; as, the rear
rank of a company.
[1913 Webster]
{Rear admiral}, an officer in the navy, next in rank below a
vice admiral and above a commodore. See {Admiral}.
{Rear front} (Mil.), the rear rank of a body of troops when
faced about and standing in that position.
{Rear guard} (Mil.), the division of an army that marches in
the rear of the main body to protect it; -- used also
figuratively.
{Rear line} (Mil.), the line in the rear of an army.
{Rear rank} (Mil.), the rank or line of a body of troops
which is in the rear, or last in order.
{Rear sight} (Firearms), the sight nearest the breech.
{To bring up the rear}, to come last or behind.
[1913 Webster]