Full of bishops, having many bishops, or characterized by abundant episcopal presence or authority.
Formed from 'bishop' plus the Old English suffix '-ful' (meaning full of or characterized by), a productive suffix that appears in 'joyful,' 'grateful,' 'helpful,' etc.
The '-ful' suffix is ancient and still works in English—you can say 'bishopful' or coin new words like 'meme-full' and English speakers will instantly understand you, because this suffix's meaning is so transparent.
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