It began to be clear that his course was taking him in a spiral, approaching the inner citadel by gradual stages.

Insensibly, by stages too gradual to portray, he reached a state where he thought of nothing.

Then, in gradual stages, an idea began to form in his slow muzzy brain.

Gradualism is a process of change by gradual, slow stages.

By stages so gradual he never realized them he learned green magic.

She insisted, however, on working up to full firepower in gradual stages, and Cimorene was forced to agree.

At first, she said, the sound seems unnaturally loud to the dog, and the volume has to be increased by gradual stages.

Artificial ice was added in gradual stages from 1939-1947.

What we must do is to work in gradual stages:

Our modern hypothesis is that the job was done in gradual evolutionary stages by natural selection.