Usuli is an Arabic word that is commonly used to refer to a set of beliefs or principles. It is often associated with Islamic jurisprudence, where it is used to describe the fundamental principles that guide the interpretation and application of Islamic law. Some synonyms for usuli include basic, essential, fundamental, foundational, and underlying. These words all suggest the importance and necessity of something, and convey the idea that without these key principles, something would not be able to function properly or be understood in the same way. As such, usuli is an essential term in the study of Islamic jurisprudence, and is central to the development of a comprehensive understanding of Islamic law.