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peripheral

pe·riph·er·al

peripheral

 
pronunciation:
p rI f rl [or] p rI frl
parts of speech:
adjective, noun
features:
Word Parts
part of speech: adjective
definition 1: of, relating to, or forming a periphery.
antonyms:
central
similar words:
marginal
definition 2: concerned with the superficial; not really essential.
These issues are peripheral to our current discussion and can be dealt with at a later time.
antonyms:
central, essential, fundamental, integral, key, real, vital
 
part of speech: noun
definition: an auxiliary device, such as a disk, printer, scanner, or the like, that is used with a computer to increase its functional range or efficiency.
derivation: peripherally (adv.)