1
: a polished or smooth surface (as of glass) that forms images by reflection
She looked at herself in the mirror.
2
a
: something that gives a true representation
… the press as a mirror of public opinion …—
C. G. Bowers
C. G. Bowers
b
: an exemplary model
The building is a mirror of functionality.
mirrored; mirroring; mirrors
1
: to reflect in or as if in a mirror
The clouds were mirrored in the lake.
2
: resemble
His mood mirrored the gloomy weather.
Examples of mirror in a Sentence
Noun
breaking a mirror is supposed to bring seven years of bad luck
Verb
The building was mirrored in the lake.
the still waters of the pond mirroring the cloudless sky above
Recent Examples on the Web
Maggie Horton, PEOPLE, 26 Dec. 2025
The concept of using light as a weapon dates back over 2,000 years to ancient Greece, where commander Hippocrates used polished mirrors to set Roman ships ablaze.
—Kapil Kajal, Interesting Engineering, 26 Dec. 2025
Nandika Chatterjee, Time, 27 Dec. 2025
Chalamet mirroring Marty’s high ambition has put a spotlight on table tennis.
—Lexi Carson, HollywoodReporter, 26 Dec. 2025
See All Example Sentences for mirror
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Noun
However, with the season of decorating in the rear view mirror, limited quantities remain, so grab your favorites before they’re gone.
—Maggie Horton, PEOPLE, 26 Dec. 2025
The concept of using light as a weapon dates back over 2,000 years to ancient Greece, where commander Hippocrates used polished mirrors to set Roman ships ablaze.
—Kapil Kajal, Interesting Engineering, 26 Dec. 2025
Verb
That number has since slipped 9 points, mirroring the broader slide in his overall job approval.
—Nandika Chatterjee, Time, 27 Dec. 2025
Chalamet mirroring Marty’s high ambition has put a spotlight on table tennis.
—Lexi Carson, HollywoodReporter, 26 Dec. 2025
See All Example Sentences for mirror
Cite this Entry
“Mirror.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mirror. Accessed 31 Dec. 2025.
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Medical Definition
mirror
noun
mir·ror
ˈmir-ər 
: a polished or smooth surface (as of glass) that forms images by reflection
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