In an auxiliary or supporting manner; serving as a help or aid rather than as a primary function.
From 'auxiliary' + '-ly' (in the manner of). Standard English adverbial formation from the Latin-derived adjective, though rarely used compared to 'auxiliarily.'
While 'auxiliarly' is technically correct, most speakers prefer 'auxiliarily'—a fascinating example of how English adverbs competing for the same function create variation, with the longer form eventually winning out.
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