alteration (conformed to -ible) of earlier defesable, borrowed from Anglo-French, from de- de- + fesable "doable, feasible," after defaire, desfaire "to undo, put an end to, destroy, nullify" — more at defeat entry 1
15th century, in the meaning defined above
“Defeasible.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/defeasible. Accessed 11 Dec. 2023.
Nglish: Translation of defeasible for Spanish Speakers
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