Definition of "terraform"
verb
third-person singular simple present terraforms, present participle terraforming, simple past and past participle terraformed
(chiefly science fiction) To transform the atmosphere (or biosphere) of another planet into one having the characteristics of Earth.
Quotations
He had been the original claimant of Obania, forty years ago; and Drake was the young spatial engineer he employed to terraform the little rock, only two kilometers through—by sinking a shaft to its heart for the paragravity installation, generating oxygen and water from mineral oxides, releasing absorptive gases to trap the feeble heat of the far-off Sun.
1942 July, Jack Williamson, “Collision Orbit”, in Astounding Science-Fiction, volume 29, number 5, page 82