To transform a landscape on another planet into one having the characteristics of landscapes on Earth: In the science fiction book that Jake was reading, the creatures were terraforming their land to make it look like that of the Earth.

The strange organisms were terraforming the environment of their celestial planet in order to make it capable of supporting earth-life forms.

The organisms wanted to terraform its surface and atmosphere so that life as it exists on Earth would be feasible.

1. The deliberate process of modifying a planet, moon or other body, to a more earth-like habitable atmosphere, temperature, and ecology: Mr. Timmons, Mary'S teacher, asked his students if they could imagine that terraforming could really be a realistic thing in the future.
2. Used very broadly as a synonym for "planetary engineering" in general: Since space exploration is in its infancy, a good deal of terraforming remains very speculative and serves to stimulate the imaginations of science-fiction writers.