Antonyms for the phrase "made null and void" include "validated," "authorized," "established," "accepted," and "approved." When something is validated, it means that it has been confirmed to be accurate or in good order. Similarly, when something is authorized, it has been given official permission or approval. Additionally, the term "established" indicates that something has been confirmed as true, while "accepted" implies that it has been acknowledged for its merit or value. Finally, when something is approved, it has been given the official sanction of an authority. Overall, these antonyms for "made null and void" highlight the significance of legitimacy, validation, and authorization.