In a compatible manner; in a way that allows coexistence or proper functioning together.
From compatible + -ly (adverbial suffix from Old English). The -ly suffix transforms adjectives into adverbs indicating manner.
'Compatibly' is technically correct but rarely used because English speakers prefer 'in a compatible way' or just say things 'work together'—it's another example of how English avoids adverbs ending in -ly when simpler phrases exist.
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