Question

define time dilation?

Answer 1

According to the theory of relativity, time dilation is a difference in the elapsed time measured by two observers, either due to a velocity difference relative to each other, or by being differently situated relative to a gravitational field.


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Answer 2

ʜᴇy ᴍɪꜱ;)
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a slowing of time in accordance with the theory of relativity that occurs in a system in motion relative to an outside observer and that becomes apparent especially as the speed of the system approaches that of light

— called also time ᴅɪʟᴀᴛᴀᴛɪᴏɴ
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ʜᴏᴩᴇ ɪᴛ ʜᴇʟᴩꜱ