Posterior/pɑːˈstɪriər/ Definition 1 of 4Pro Tip 1/2Visual Imagery Imagine an object with a front and back to remember 'posterior' refers to the rear. The posterior compartment of the vehicle stores luggage. Pro Tip 2/2Spatial Relationships Use 'posterior' when describing the back position of something in spatial contexts. She attached the ribbon to the posterior side of the gift.