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Synonyms for Renounce (same or very similar meaning)

WordNet sense 1 (give up, such as power, as of monarchs and emperors, or duties and obligations):
abdicate

WordNet sense 2 (leave (a job, post, or position) voluntarily):
resign, vacate, resign, give up

WordNet sense 3 (turn away from; give up):
quit, relinquish, foreswear

WordNet sense 4 (cast off or disown):
repudiate


From the ODE community, based on WordNetadd/edit