Meaning of あっせい in Japanese

民衆は圧制に立ち向かった。
The people revolted against the tyranny.

地球側の圧政に苦しむコロニーの人々の中で、テロによる現状打破を目論む勢力が誕生。
Among the people of the colonies suffering under Earth's tyranny a force emerges intending to overthrow the status quo through terrorism.

彼は、前の政府に劣らず圧制的な現政府に公然と反抗している。
He defies the present government which is no less oppressive than its predecessor.