verb (used with object)
to alter the environment of (a celestial body) in order to make capable of supporting terrestrial life forms.

1975–80; terra + form; perhaps taken as v. use of an adj. with -form as second element

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World English Dictionary
terraforming (ˈtɛrəˌfɔːmɪŋ)
planetary engineering designed to enhance the capacity of an extraterrestrial planetary environment to sustain life
[C20: from Latin terra earth + forming]

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