Prolong/prəˈlɔːŋ/ Definition 1 of 2Pro Tip 1/3Positive Extension Often implies a desirable increase in time or experience. Vacationers might prolong their trip to enjoy more sights. Pro Tip 2/3Planned Duration Suggests a deliberate action to make something last, not by chance. She read slowly to prolong the enjoyment of the book. Pro Tip 3/3Time Sensitivity Used when time is an important factor in the context. The director decided to prolong the deadline for the project submission.