Can anyone Define Time ??

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Is it Possible to Define Time ??Is Space = Time ????Now Time...ya its an instance but we need the term 'time' due to two things i think 'space' and light..we distinguish between instances of two different positions of a body in space and call it time....but it is interfered by a thing called light....We know the speed of light...when we see something far away countable in light years we are actually seeing past....because if some changes happen at this instant far away we will come to know about it only when the light at the spot of happening reaches us....so as we see far we see across time....isn't it...just let meknow if there are any dumb lines by me