All 3 Uses

partition
in
Crediting Poetry, by Seamus Heaney
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The crux of that problem involves an ongoing partition of the island between British and Irish jurisdictions, and an equally persistent partition of the affections in Northern Ireland between the British and Irish heritages;†
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The crux of that problem involves an ongoing partition of the island between British and Irish jurisdictions, and an equally persistent partition of the affections in Northern Ireland between the British and Irish heritages;†
but surely every dweller in the country must hope that the governments involved in its governance can devise institutions which will allow that partition to become a bit more like the net on a tennis court, a demarcation allowing for agile give-and-take, for encounter and contending, prefiguring a future where the vitality that flowed in the beginning from those bracing words "enemy" and "allies" might finally derive from a less binary and altogether less binding vocabulary.†

Definitions:

(1) (partition)
to divide something into parts; or a divider itself, or one of the sections created
(2) (meaning too rare to warrant focus)