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To 'renounce' something means to formally give up or resign from it. This term often implies a public declaration or an explicit decision to no longer support or adhere to an idea, belief, or position. By using 'renounce,' one conveys a strong intention to sever ties with something previously accepted or endorsed.

For example, a person might renounce a membership in an organization, signalling that they no longer wish to be associated with that group. This action can evoke a sense of finality or seriousness about the decision to abandon that commitment. It is distinct from simply not acting on something; renouncing implies a proactive and often public step away from something once held.

In contrast, the other choices do not align with the meaning of 'renounce.' Embracing something fully suggests acceptance and commitment, whereas justifying an action involves providing reasoning for it. Adopting officially implies taking something on or accepting it, which is the opposite of renouncing. Therefore, the notion of formally giving up something is what makes the second choice the correct understanding of 'renounce.'