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Webster 1913 Edition

Adj.

[See

Capable of being annulled or made void;

as, a

defeasible

title

–

De-fea′si-ble-ness

Noun.

Adj.

S as z. That may be defeated, or annulled; as a defeasible title; a defeasible estate.

defeasible ‎(comparative more defeasible, superlative most defeasible)

(law, logic) Capable of being defeated, terminated, annulled, voided or invalidated.
The accounting charge for the non-callable debt is defeasible by an escrow.

capable of being defeated, invalidated, …