Progress is more often used as the concept, where progression is more often used to refer to a concrete instance-- that's how I preceive the fine difference. The verb progress (stress on the second syllable) seems reasonably common to me, though I have never counted its instances. com/progress%26r%3D67&usg=AFQjCNFWdsOUZN_iqi0qQrAkNTJ6wldyrg ".
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