Definition of microcosm
1
: a little world;
especially
: the human race or human nature seen as an epitome (see epitome 1) of the world or the universe
2
: a community or other unity that is an epitome (see epitome 2) of a larger unity
- The suburb has been the microcosm of the city.
—
in microcosm
: in a greatly diminished size, form, or scale
