Therein/ˌðerˈɪn/ Definition 1 of 2Pro Tip 1/3Location Focus Use 'therein' to emphasize something within a place or concept mentioned earlier. The laws of physics, and the beauty therein, fascinate many. Pro Tip 2/3Litigation Language 'Therein' is often seen in legal or formal documents, giving a sense of solemnity. The contract specifies the obligations therein. Pro Tip 3/3Whole Entity 'Therein' implies being inside something as a whole, not just a part. Our destiny is shaped by our decisions and the courage therein.