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noun
The principle of succession in royal families, especially among the Eastern Roman emperors, by which a younger son, if born after the accession of his father to the throne, was preferred to an elder son who was born prior to it.
Definition source: English Wiktionary via Wiktextract
Usage: rare, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From porphyrogenite + -ism.
