mirror

noun

1. A smooth surface, usually made of glass with reflective material painted on the underside, that reflects light so as to give an image of what is in front of it.

   “I had a look in the mirror to see if the blood had come off my face.”

   “He broke the mirror with the pickaxe.”

   “We could see the lorry in the mirror, so decided to change lanes.”

2. (figuratively)An object, person, or event that reflects or gives a picture of another.

   “His story is a mirror into the life of orphans growing up.”

   “O goddess, heavenly bright, / Mirror of grace and majesty divine.”

3. (Internet)A website or server that contains replicated data from another site.

   “Although the content had been deleted from his blog, it was still found on some mirrors.”

4. A mirror carp.
5. (historical)A kind of political self-help book, advising kings, princes, etc. on how to behave.

verb

1. (transitive)To reflect, as in a mirror.
2. (transitive)To act as a reflection of, either by being identical to, or by being identical but reversed.

   “The placement of the paintings mirrored the positions of the windows on the opposite wall.”

3. (transitive)Of an event, activity, behavior, to be identical to; to be a copy of; to imitate closely.

   “He tried to mirror Elvis's life by copying his fashion and mannerisms.”

4. (Internet, transitive)To create something identical to (a website, etc.).