Full record for world-building n.

Definition the creation of fictional planets and their geology, geography, biology, etc., often including the history and culture of their inhabitants
OED requirements antedating 1920
Earliest cite A.S. Eddington, 'Space, Time and Gravitation'
Last modified 6 July, 2008

Citations for world-building n.

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1992 Locus Aug. 22/1 Vance‥has a ‘supreme skill in world-building, the creation of alien societies completely imagined’.
1993 Locus June 38/2 (advt.) Glory Season , is an example of modern world-building, in which all aspects of an alien world‥have been conceptualized.
1994 Analog Science Fiction & Fact Jan. 185/1, I realized that this physics idea often arises in SF discussions in connection with black holes or space construction or ‘world building’ for story backgrounds.
1995 Interzone Feb. 32/2 Science fiction reviewers—and readers, too—tend to be finicky about “world building,” fretting unduly, it always seems to me, over whether the fictional world could really exist given the writer's scenario, worrying over the bits the writer hasn't explicitly elucidated in the text.