In a manner that occurs or exists at the same time; simultaneously or concurrently.
From cotemporaneous plus the adverbial suffix '-ly'. This adverbial form transforms the adjective into a way of describing how actions or events occur together in time.
Adding '-ly' to adjectives to make adverbs is one of English's simplest tricks, but words like this show how it lets us describe the timing of multiple events with precision—everything happens cotemporaneously!
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