suppositional

/ˌsʌpəˈzɪʃənəl/
adjective
  1. Based on or involving a supposition; assumed or hypothetical rather than proven.
    • Her suppositional reasoning led the team to explore new possibilities.
    • The story was entirely suppositional, with no basis in real events.
    • The scientist presented a suppositional model of how the universe began.
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