What are the scientific definitions of "moment (of time)" and "instant"? Are they different with their definitions in everyday language? I also don't know the definitions in everyday language, of course if there are any. I came to this question, while reading a wikipedia page (Instant) which defines instant as "an infinitesimal moment in time, a moment whose passage is instantaneous" and I got confused. Why not say an infinitesimal "interval" in time? Before coming to this, I thought instant and moment are EXACTLY equal in meaning, but I seemed to be wrong.
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