Final answer:
Definition 3, medical is the section in most need of proofreading and editing before including the information in an oral or written presentation.
Step-by-step explanation:
The section that is in MOST need of proofreading and editing before including the information in an oral or written presentation is Definition 3, medical. Proofreading and editing is crucial in ensuring that the information presented is accurate, coherent, and free from errors. For medical definitions, it is especially important to be precise and clear to avoid any misunderstandings and potential harm.