In a manner relating to graphemes or the written units of language; from the perspective of writing systems rather than spoken language.
From 'graphemic' plus the adverbial suffix '-ally,' following standard English adverb formation conventions from adjectives.
When linguists describe something 'graphemically,' they're privileging the written representation over what people actually say—useful for spotting patterns like how 'knight' and 'night' are graphemically distinct but phonetically identical.
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