polished surface that forms images by reflecting light
"The antique mirror on the wall reflected my smile so clearly that I could see every detail of my face."
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.
"She polished the bathroom mirror until her reflection was crystal clear before applying lipstick."
In plain English: A mirror is a smooth surface that reflects your image so you can see yourself.
"She checked her appearance in the mirror before leaving the house."
Usage: Use "mirror" as a noun to refer to a flat or curved reflective surface, typically made of glass, used for viewing one's own reflection. You can also apply it metaphorically to describe something that closely resembles or reflects another situation, such as saying the data mirrors current trends.
Of an event, activity, behaviour, etc, to be identical to, to be a copy of.
"The chaotic traffic in London seemed like a perfect mirror of the gridlock we experienced in Tokyo last year."
In plain English: To mirror means to copy someone else's actions or feelings exactly.
"The tall building mirrored the skyscraper across the street."
Usage: Use "mirror" when describing how one situation, trend, or behavior exactly reflects or duplicates another. It is often used in contexts like saying that sales figures mirror last year's performance or that an action mirrors a previous event.
The word mirror entered English from French and originally meant a "looker" or "watcher." It replaced an earlier native term that had carried the same meaning but also referred to a spy.