Re-institution refers to the act of restoring or re-establishing something. The antonyms for re-institution can vary depending on the context in which the word is being used. However, some possible antonyms are: abolish, discontinue, end, halt, abandon, break, demolish, dismantle, invalidate, repeal, stop, terminate, and withdraw. These words convey the opposite sense of restoring or re-establishing something, instead suggesting a cessation or permanent stoppage of an action, process or institution. Using antonyms can be a powerful way to clarify meaning and convey different shades of ideas.