If a country or a system is democratized, it is made democratic.
例句
...a further need to democratize the life of society as a whole...进一步从整体上加强社会生活民主化的需要When he left his native country, he said he would not return until it had been fully democratised.离开祖国时，他说直到国家完全实现民主化后他才会回来。