Hypertext Webster Gateway: "indefeasible"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Indefeasible \In`de*fea`si*ble\, a. [Pref. in- not + defeasible:
cf. OF. indefaisable.]
Not to be defeated; not defeasible; incapable of being
annulled or made void; as, an indefeasible or title.
That the king had a divine and an indefeasible right to
the regal power. --Macaulay.
From WordNet (r) 1.7 (wn)
indefeasible
adj : not liable to being annulled or voided or undone; "an
indefeasible right to freedom"; "an indefeasible claim
to the title" [ant: {defeasible}]
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