Insert/ɪnˈsɜːrt/ Definition 1 of 4Pro Tip 1/3Physical Action Use 'insert' when describing a physical movement of placing something inside another. He inserted the letter into the envelope. Pro Tip 2/3Precise Fit Often implies the need for precision, such as parts fitting together correctly. Insert tab A into slot B carefully. Pro Tip 3/3Temporary Placement Suggests that the inserted item may be removed or is not permanent. Can you insert a bookmark where you stop reading?