Longman Dictionary of Contemporary English homepage

peripheral

1 adjective
     
Related topics: Computers
pe‧riph‧e‧ral1
1 formal not as important as other things or people in a particular activity, idea, or situation:
a diplomat who had a peripheral role in the negotiations
Her involvement in the case was peripheral.
peripheral to
The romance is peripheral to the main plot of the movie.
2 formal in the outer area of something, or relating to this area:
the city's peripheral suburbs
the peripheral nervous system
3

peripheral vision

your ability to see things to the side of you when you look straight ahead
4TDTD technical peripheral equipment can be connected to a computer and used with it
peripherally adverb

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