revolution - A complete change either in the way people think or in a country's political system., turning point - The time when an important change begins to happen (two words)., development - An event that changes a situation, or the process of growing or changing., spread - When something increases and affects more people., advance - Any change, discovery or invention that makes the world better., movement - A group of people that works to achieve an aim., invention - A machine, tool, system, etc., made for the first time., foundation - The basic idea or principle behind something., discovery - Something that someone learns about when it was not known before., progress - Change that improves something.,

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