Preclusion means the act of preventing something from happening or keeping something from being achieved. Therefore, the antonyms of preclusion would be those that signify permission or allowance. One antonym for preclusion is "permission," which refers to giving someone the authority to do something. The opposite of preclusion can also be "admittance," which means the act of allowing someone entry or access. Another antonym for preclusion is "inclusion," which denotes the act of incorporating something into a group or set. There are several more antonyms for preclusion, including "facilitation," "allowance," "access," and "inclusion," all of which imply the opposite of exclusion or prevention.