In a way that is shortened, condensed, or made brief; using abbreviations.
From 'abbreviate' + '-ly' (Old English adverbial suffix). This creates an adverb meaning 'in an abbreviated manner,' following standard English word-formation patterns.
This adverb is rarely used in modern English, which is interesting because it's so easy to form but nobody really needs it—we just say 'briefly' or 'in short' instead, showing how some grammatically correct words just don't catch on.
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