Margin/ˈmɑːrdʒɪn/ Definition 1 of 4Pro Tip 1/3Physical Objects Margin as a physical boundary of tangible items like books or pages. Please write your name on the top margin of the sheet. Pro Tip 2/3Note-taking Space Margins in books or notebooks are often used for additional notes. I jotted down the translation in the book's margin. Pro Tip 3/3Visual Clarity Keeping wide margins in documents improves readability and structure. Leave wider margins to make your report look cleaner.