A fictional story with scientific elements, which may or may not be correct. Whether the scientific elements are correct or not is irrelevant, science-fiction refers to a fictional story with...
Science fiction is also know by the name speculative fiction. Science fiction speculates or postulates about "what ifs" and almost always contains an element of science or technology in the story.
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dictionary.com defines "define" as: 1. to state or set forth the meaning of (a word, phrase, etc.) 2. to explain or identify the nature or essential qualities of 3. to fix or lay down definitely;...