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Webster 1913 Edition

Noun.

The act of disaffirming; denial; negation.

(Law)

Overthrow or annulment by the decision of a superior tribunal;

as,

disaffirmance

of judgment

Noun.

Denial; negation; disproof; confutation.

Overthrow or annulment, by the decision of a superior tribunal; as disaffirmance of judgment.

disaffirmance ‎(countable and uncountable, plural disaffirmances)

(law) The act of disaffirming; denial.
(law) Overthrow or annulment by the decision of a superior tribunal.
disaffirmance of judgement