To contest or dispute; to engage in or carry on a contest; to call into question.
From Latin 'contestari' (con- + testis, witness), meaning originally 'to call to witness against.' The English verb 'contestate' is a back-formation from 'contestation,' preserving the Latin meaning.
This verb is almost archaic, but legal documents still use 'contestate' when parties formally challenge claims—it's the precision language that lawyers love because it echoes the original Latin meaning of 'calling witnesses'!
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