renunciation
noun
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the act of renouncingforgoingforswearing
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rejecting or disowning or disclaiming as invalidrepudiation
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an act (spoken or written) declaring that something is surrendered or disownedrenouncement
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the state of having rejected your religious beliefs, your political party, or a cause, often in favor of opposing beliefs or causes“My renunciation of the religion I grew up in did not please my parents.”defection