c
: a calling into question or discrediting (as the purity of one's motives or one's honesty)
the impeachment of his character the impeachment of the witness's testimony
d
: a calling to account for some high crime or offense before a competent tribunal : arraignment
especially
: the arraignment (as of a public official) for misconduct while in office
e(1)
: conviction of bias, venality, invalidity, or other fault
(2)
: conviction of misconduct and usually removal of office
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Merriam-Webster unabridged
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