Meaning of 急速 in Japanese

In the midst of this, it is IT that has made great progress.

To prevent the disease from spreading quickly was not an easy task.

That market has been rapidly expanding.

Hope of finding the child alive is fading rapidly.

The country was industrialized very quickly.

The rapid growth of the firm was attributed to its unique strategy.

The news spread fast.

This may be because of a change in people's attitude toward marriage and the sharp increase of fast food restaurants and convenience stores which are open 24 hours a day and enable young people to live more easily.

The birthrate is rapidly declining in this country.

This extraordinary increase is explained by the speedy economic unification which took place during the same period.