Definition of "microcosm"

The Christian humanists were emphatic in their demand that a man who wishes to understand himself must realize that he is a little world that reflects on a smaller scale the larger world of the universe. […] On the other hand, the whole idea of man as a microcosm was questioned by those who were not in sympathy with the Christian humanists.

1972, Rolf Soellner, Shakespeare's Patterns of Self-Knowledge, Chapter 3: Microcosm and Macrocosm: Framing The Picture of Man, page 43

If you see this in the Map of my Microcosme, followes it that I am knowne well enough too?

c. 1608–1609 (date written), William Shakespeare, “The Tragedy of Coriolanus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act II, scene i]

‘In a sense, the problems experienced at Bristol are like a microcosm of what is happening in the NHS - experienced surgeons battling against difficult circumstances, with inadequate resources and in a culture where the finding of scapegoats appears to be put before the finding of solutions.’

1999 December 16, Barry McIntyre, The Guardian

Steve Bruce's side have swung from highs to lows in what has been at best a wildly inconsistent start to the season. They experienced a microcosm of this within the opening 45 minutes at the Stadium of Light.

2011 October 1, Phil Dawkes, “Sunderland 2 - 2 West Brom”, in BBC Sport‎

It should come as no surprise to see promotional material and bulletin boards in the department’s languages, though English is also present in the signage of this microcosm of the institution.

2019, Li Huang, James Lambert, “Another Arrow for the Quiver: A New Methodology for Multilingual Researchers”, in Journal of Multilingual and Multicultural Development, page 5

The method is relatively labour intensive (24-30 microcosms are run) and more difficult to interpret when compared with other microcosm methods (Shannon et al. 1986; Cairns & Cherry 1993).

2009, Jerry C. Smrchek, Maurice G. Zeeman, Chapter 3: Assessing Risks to Ecological Systems from Chemicals, Peter P. Calow (editor), Handbook of Environmental Risk Assessment and Management, page 53