Predefine is a term that means to set or establish something before it happens. Synonyms for this word include predetermined, preset, prearranged, predetermined, predetermined, preordained, preplanned, planned in advance, or established before. These words relate to the act of setting things in motion for a particular event or action, and they often refer to actions that have been decided on before they occur. Using these synonyms in your writing can help you communicate more effectively and accurately, as well as enhance your vocabulary. Whether you are writing a research paper or creating a business proposal, being able to use synonyms effectively can help you express yourself more clearly and precisely.