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Definition of mirror
a reflective surface, now typically of glass coated with a metal amalgam, that reflects a clear image. something regarded as accurately representing something else:the stage is supposed to be the mirror of life (also mirror site) Computing a site on a network that stores some or all of the contents from another site.
verb [with object]
(of a reflective surface) show a reflection of:the clear water mirrored the sky correspond to:gradations of educational attainment that mirror differences in social background Computing keep a copy of some or all of the contents of (a network site) at another site, typically in order to improve accessibility.
(usually as noun mirroring
) Computing store copies of data on (two or more hard disks) as a method of protecting it.