In a manner that serves to distinguish or mark differences; using or with respect to diacritical marks.
From diacritical + -ly (adverb suffix). Forms the adverbial version describing how something functions or is done with diacritical distinction.
When linguists write diacritically—using all the proper accents and marks—they're actually preserving sound information that would be lost without them, like capturing the exact pronunciation in stone.
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