1pe·riph·er·al 
/pəˈrɪfərəl/ adjective
/pəˈrɪfərəl/ adjective 1 [more peripheral; most peripheral] formal : not relating to the main or most important part
▪ If we focus too much on peripheral issues, we will lose sight of the goal. — often + to ▪ His role in the negotiations was peripheral to the outcome. [=his role in the negotiations was not important in deciding the outcome] 2 computers : connected to a computer but not an essential part of it
▪ peripheral devices/equipment such as modems and scanners 3 : of or relating to the area that is to the side of the area you are looking at
▪ He saw in his peripheral vision that a car was trying to pass him. 4 medical : of or relating to the part of the nervous system that is separate from the brain and spinal cord
▪ peripheral nerves ▪ the peripheral nervous system
▪ If we focus too much on peripheral issues, we will lose sight of the goal. — often + to ▪ His role in the negotiations was peripheral to the outcome. [=his role in the negotiations was not important in deciding the outcome]
▪ peripheral devices/equipment such as modems and scanners
▪ He saw in his peripheral vision that a car was trying to pass him.
▪ peripheral nerves ▪ the peripheral nervous system
— pe·riph·er·al·ly adverb
▪ He was only peripherally involved in the sale of the house. [=he played a small part in the sale of the house]
▪ He was only peripherally involved in the sale of the house. [=he played a small part in the sale of the house]
