A material change in circumstances is one that, if known at the time the original order was granted, would likely have resulted in different terms. The change cannot be relied on if it was known at the time of the original order. The court must first consider if a material change of circumstances has occurred, and then determine what variation should be ordered: Willick v. Willick, 1994 CanLII 28 (SCC), [1994] 3 S.C.R. 670, at paras. 20-21, 26.
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