vitiate


Concise Oxford English Dictionary © 2008 Oxford University Press:
vitiate /ˈvɪʃɪeɪt/
verb formal spoil or impair the quality or efficiency of.

■ destroy or impair the legal validity of.

– derivatives
vitiation noun,
vitiator noun.
– origin C16: from L. vitiat-, vitiare ‘impair’.
'vitiate' also found in these Oxford entries:

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