Definition of microcosm
1
: a little world
especially
: the human race or human nature seen as an epitome (see epitome sense 1) of the world or the universe
2
: a community or other unity that is an epitome (see epitome sense 2) of a larger unity
The suburb has been the microcosm of the city.
in microcosm
: in a greatly diminished size, form, or scale
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Merriam-Webster unabridged
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Time Traveler for microcosm
The first known use of microcosm was in the 15th century
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