suposición
/suposiˈθjon/ · B2 · noun · f
premise
🤔 suposición = supo(ner) 'to suppose' + -ición, the noun ending like English -ition
Suposición comes from Latin supponere, 'to place under' (sub + ponere). A supposition is an idea placed underneath an argument as its base. Same root as English suppose and supposition; the Spanish verb is suponer.