Progress,  【progression】  are not always clearly distinguished, although they can be more or less sharply differentiated.

Both denote movement forward.

Progress (see also  【progress 】 n under ADVANCE 2 ) usually applies to a movement considered as a whole, stressing such aspects as the distance covered, the change or changes taking place, and the amount of improvement made.

【Progression】  (see also SUCCESSION ) commonly applies to a movement in itself or in its detail, often implying a continuous series of steps, degrees, or stages toward an objective but sometimes implying little more than a moving on more or less continuously.

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