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Adjective suppositional has 1 sense
conjectural, divinatory, supposed, suppositional, suppositious, supposititious - based primarily on surmise rather than adequate evidence; "theories about the extinction of dinosaurs are still highly conjectural"; "the supposed reason for his absence"; "suppositious reconstructions of dead languages"; "supposititious hypotheses"Antonyms:  empirical, empiric (indirect, via theoretical)
 
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