What is the best definition for the word proscribe?

The correct definition of the word "proscribe" is "forbid." This term originates from the Latin word "proscribere," which means to publish or declare officially. In contemporary usage, to proscribe something means to prohibit or to formally forbid it, often through laws or regulations. It conveys a sense of authority in banning certain actions, behaviors, or substances.

Understanding this term is particularly important in contexts related to law, ethics, or governance, where specific actions may be deemed unacceptable and are thus forbidden for the good of the community or society. This aligns with the commonly used concepts such as proscribed conduct in legal frameworks or guidelines.