world(redirected from What in the World)
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1. the earth as a planet, esp including its inhabitants
2. mankind; the human race
3. the universe or cosmos; everything in existence
4. a complex united whole regarded as resembling the universe
5. any star or planet, esp one that might be inhabited
6. an area, sphere, or realm considered as a complete environment
7. Logic See possible world
Pertaining to Lorentz transformations and four-dimensional space-time, rather than rotations and three-dimensional space, as in world scalar, world vector, world line.