noun [C usually sing]
The periphery is also the less important part
of a group or activity.
Many
women feel they are being kept on the periphery of the armed forces.
peripheral
adjective
If something is peripheral, it is not as important
as something else.
Let's
not worry about peripheral issues.
The
book contains a great deal of peripheral detail.
Peripheral also means happening at the edge of
something.
A
figure came into my peripheral vision.
peripheral
noun [C] SPECIALIZED
A peripheral is a piece of equipment, such as
a printer, that can be connected to a computer.