mirror
US /ˈmɪr.ɚ/
UK /ˈmɪr.ɚ/

1.
a surface, typically of glass coated with a metallic amalgam, which reflects a clear image
:
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She looked at herself in the mirror.
•
The car has a rearview mirror.
2.
a thing that accurately reflects or represents something else
:
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The novel is a mirror of society.
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His actions are a direct mirror of his beliefs.