to refuse to have anything to do with (something)
to refuse to accept (something); esp to reject it as unauthorized or invalid
to reject (e.g. a charge) as untrue or unjust
to refuse to acknowledge or pay (e.g. a debt)
archaic to divorce or disown (a wife)
repudiation /-ʹaysh(ə)n/ noun
[Latin repudiatus, past part. of repudiare, from repudium divorce]