1A county or district — an administrative subdivision below a prefecture that groups several towns and villages; in modern Japan it survives mainly as part of address names rather than as a governing body.
私の実家は今もその郡に含まれている。
My family home is still part of that county.
住所を書くときは市町村名の前に郡名が入ることがある。
When writing an address, the county name sometimes comes before the town or village name.
明治時代に多くの郡が再編成された。
Many counties were reorganized during the Meiji era.
2A historical administrative unit under Japan's ritsuryō system, positioned below a province (kuni) and organized to group a set number of households into subordinate hamlets (ri).
律令制の郡は、およそ二十里ほどの規模で編成された。
Under the ritsuryō system, a district (gun) was organized to encompass roughly twenty ri (hamlets).
3A commandery — a local administrative unit in Qin- and Han-dynasty China, governed by officials dispatched from the central government under the commandery system.
秦は全国を郡と県に分けて統治した。
The Qin dynasty governed the entire country by dividing it into commanderies and counties.