1. noun /ˈmɪɹ.ə/lang=en/ˈmiɹ.ɚ,ˈmɪɹ.ɚ,ˈmiɚ/lang=en
a) 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.
b) an object, person, or event that reflects or gives a picture of another.
2. verb /ˈmɪɹ.ə/lang=en/ˈmiɹ.ɚ,ˈmɪɹ.ɚ,ˈmiɚ/lang=en
a) Of an event, activity, behaviour, etc, to be identical to, to be a copy of.
b) To create something identical to (a web site, etc.).
Wikipedia foundation.