In a manner that occurs or happens at exactly the same moment; with perfect simultaneity.
From coinstantaneous + -ly (adverbial suffix). Derives from co- + instantaneous, forming an adverb to describe simultaneous action with philosophical precision.
This adverb appears in dense philosophical texts when writers want to emphasize that two things happened with zero time difference between them—a much stronger claim than just saying they happened 'at the same time.'
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