Preestablish is a word that means to establish or arrange beforehand. This term is mainly used in the legal or political context. However, in writing, it is often advantageous to try to avoid repetition. Therefore, if you find yourself using preestablish several times throughout your document, it may be beneficial to consider using synonyms. Some synonyms for preestablish include prearrange, preordain, set up, plan ahead, and preplan. These words are interchangeable, and they can be used to convey a similar meaning as preestablish. By using synonyms, you can enhance the clarity and precision of your writing.