In a manner that can be combined or in a way that allows combination.
From 'combinable' plus the adverb suffix '-ly' (from Old English 'lice' meaning 'like' or 'in the manner of'). This creates an adverb form, though it's rarely used in contemporary English.
This adverb is technically correct but almost never used because English prefers simpler phrases like 'in combination with' — it's a word that technically exists but has been abandoned by actual speakers.
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