Etymology
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science fiction (n.)

1929 (in advertisements for "Air Wonder Stories" magazine), though there is an isolated use from 1851. See science + fiction. Earlier in same sense was scientifiction (by 1926). Abbreviated form sci-fi is by 1955. 

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Definitions of science fiction

science fiction (n.)
literary fantasy involving the imagined impact of science on society;
From wordnet.princeton.edu