In most contexts there's no difference. Click here for examples. )
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I agree with Tomasz; these two terms may be interchangeable. I couldn't find any evidence that perhaps one might be more more suitable to mark sombre or serious anniversaries. I really couldn't bring myself to say 'the centennial of the Holocaust' is approaching. It would seem more appropriate to use a word that somehow refects the gravity of the event and so I would want to use 'centenary of