Non-admission means the act of refusing to allow something or someone to enter a particular place or group. Antonyms for this word include acceptance, admission, allowance, approval, authorization, clearance, entrance, inclusion, permission, and visa. These antonyms connote the act of letting something or someone in or enabling them to participate in a particular event or group. For instance, acceptance means the endorsement of a particular idea, proposal, or person, while authorization refers to the granting of legal or official approval to do something or be in a particular place. Therefore, when used appropriately, antonyms for non-admission can help to convey a positive and inclusive message.