Herein/ˌhɪrˈɪn/ Definition 1 of 2Pro Tip 1/3Document Precision Used to specify details precisely in legal or formal documents. Any amendments made herein must be ratified by both parties. Pro Tip 2/3Excludes Outsiders Implies that only people familiar with the document understand its contents. The responsibilities stated herein are binding to the signees. Pro Tip 3/3Legalese Language Often found in legal contexts; may be less clear in everyday speech. The party herein agrees to maintain confidentiality.