Under the assumption of the existance of the Christian god (existing always in the past, present, and future, simultaneously) time HAS to be non-linear. Without this idea, though, time is merely how mankind compartmentalizes the passing of events into segments small enough to be manageable to the human brain. No human being can actually comprehend the true enormity of time in the way that we percieve it, time is, as a previous poster said (don't feel like finding it to quote :-p) merely the existance of matter in a given place at a given instance.
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