In a manner relating to or characteristic of Asia; an archaic adverbial form of asiatical.
From 'asiatical' + '-ly' suffix (Old English -lice), creating an adverb that would mean 'in an Asian manner,' though this form is virtually obsolete in modern English.
Stacking '-ical' and '-ly' together shows how English speakers once loved multiple suffixes in a row—modern English has stripped these down, but remnants appear in words like 'basically' and 'logically,' showing our language is always pruning itself.
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