Plural of heirdom; multiple instances, states, or domains of being an heir or possessing the status of heir.
The regular English plural formed by adding '-s' to 'heirdom,' maintaining the same etymological structure (heir + -dom + -s) to indicate multiple heirdoms or successive states of heirship.
Using the plural 'heirdoms' suggests you're studying multiple royal lines or territories with different inheritance rules—it's the kind of word a medieval historian says while organizing their research.
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